1樓:匿名使用者
1、解:15.37*7.88-9.37*7.38+1.537*21.2-93.7*0.262
=1.537*(78.8+21.2)-9.37*(7.38+2.62)
=1.537*100-9.37*10
=153.7-93.7
=602、解:(5+93+778+8988)*12.5=(100+800+9000-36)*12.5=(9900-36)*12.5
=10000*12.5-136*12.5
=12330
3、解:=10個(0.625*8)*8*12個2=5個10次方*2個15次方
2樓:匿名使用者
1.15.37*7.88-9.37*7.38+1.537*21.2-93.7*0.262
=15.37*7.88+15.37*2.12-9.37*7.38-9.37*2.62
=15.37*(7.88+2.12)-9.37*(7.38+2.62)
=15.37*10-9.37*10
=153.7-93.7
=602.(5+93+778+8988)*12.5
=(10-5+100-7+800-22+9000-12)*12.5
=(100+900+9000-90-46)*12.5
=(10000-136)*12.5
=125000-1700
=123300
3.0.625*8*2=10,所以10個0.625*8*2=10^10,剩餘1個8,2個2,相乘得32
所以得數為3.2*10^11
3樓:愛自己是最好的
1、解:15.37*7.88-9.37*7.38+1.537*21.2-93.7*0.262
=1.537*(78.8+21.2)-9.37*(7.38+2.62)
=1.537*100-9.37*10
=153.7-93.7
=602、解:(5+93+778+8988)*12.5=(100+800+9000-36)*12.5=(9900-36)*12.5
=10000*12.5-136*12.5
=12330
4樓:傅曉潔
依據:0.625*2*8=10
取10個0.625,10個8,10個2,(0.625*2*8)的10次方,即10^10
剩餘1個8,2個2,1*8*2*2=32
得(10^10)*32
5樓:梅蘭·菊竹
15.37*7.88-9.37*7.38+1.537*21.2-93.7*0.262
=15.37(7.88+2.12)-9.37(7.38+2.62)=153.7-93.7
=60(5+93+778+8988)*12.5=(5+100-7+800-22+9000-12)×12.5=(9900-36)×12.5
=9864×25/2
=123300
6樓:
.......小學?
能簡便計算的要簡便計算五年級的試題及答案
7樓:凌月霜丶
(1)2.5*32*0.125
=(2.5*4)*(8*0.125)
=10*1
=10(2)3.5-7+6.5
=3.5+6.5-7
=3(3)1.2×2.5+0.8×2.5
=2.5(1.2+0.8)
=25(4)8.9×1.25-0.9×1.25=1.25(8.9-0.9)
=10(5)12.5×7.4×0.8
=12.5×0.8×7.4
=74(6)6.5×9.5+6.5×0.5=6.5×(9.5+0.5)
=6.5×10
=65(7)0.35×1.6+0.35×3.4=0.35*(1.6+3.4)
=0.35*5
=1.75
(8)6.72-3.28-1.72
=6.75-(3.28+1.72)
=6.75-5
=1.75
(9)0.45+6.37+4.55
=0.45+4.55+6.37
=5+6.37
=11.37
(10)28×12.5-12.5×20
=(28-20)*12.5
=8*12.5
=100
(11)23.65-(3.07+3.65)=23.65-3.65-3.07
=20-3.07
=16.93
(12)(4+0.4×0.25)8×7×1.25=(4+1)*7*10
=5*7*10
=350
(13)1.65×99+1.65
=1.65*(99+1)
=1.65*100
=165
五年級上冊數學簡便計算30道題及答案
8樓:阿維
1、24.6-3.98+5.4-6.02
解析:此題利用加法交換結合律,湊整再計算。步驟如下:
24.6-3.98+5.4-6.02
=(24.6+5.4)-(3.98+6.02)
=30-10
=202、27×17/26
解析:此題先用加法分配律,把27轉換成(26+1),再利用乘法結合律,使得運算簡便。
27×17/26
=(26+1)×17/26
=26×17/26+1×17/26
=17+17/26
=17又17/26
3、528-99
解析:利用湊整法和減法結合律計算,先利用湊整法把99變換為(100-1),再運用a-b-c=a-(b+c)來簡便計算,步驟如下:
528-99
=528-(100-1)
=528-100+1
=428+1
=429
4、1.2×2.5+0.8×2.5
解析:運用提取公因數的方法,公式:ac+ab=a(b+c),提取公因數2.5,1.2和0.8相加正好湊整數,使得運算簡便。
1.2×2.5+0.8×2.5
=(1.2+0.8)×2.5
=2×2.5
=55、2.96×40
解析:此題先利用乘法分配律,把2.96×40轉換成29.6x4,再利用乘法結合律來簡便計算。
2.96×40
=29.6x4
=(30-0.4)x4
=30×4+0.4×4
=120-1.6
=118.4
6、0.36 x 1.5 - 0.45
解析:此題運用乘法分配律,把0.45轉換成1.5 x 0.3 ,即可提取公因數1.5,再根據乘法結合律進行簡便計算。
0.36 x 1.5 - 0.45
= 0.36 x 1.5 - 1.5 x 0.3
= 1.5 × (0.36 - 0.3)
= 1.5 × 0.06
= 0.09
7、46×44/45
解析:此題先利用加法分配律把46轉換成(45+1),再利用乘法結合律:(a×b)×c=a×(b×c)使得運算簡便。
46×44/45
=(45+1)×44/45
=45×44/45+44/45
=44+44/45
=44又44/45
8、1.6×7.5×1.25
解析:此題利用乘法分配律把1.6,轉化成2×0.8,再利用乘法結合律:(a×b)×c=a×(b×c)湊整,進行簡便計算。
1.6×7.5×1.25
=2×0.8×7.5×1.25
=(2×7.5)×(0.8×1.25)
=15×1
=159、0.72×10.1
解析:此題先利用加法分配律,把10.1轉換成10+0.1,再利用乘法結合律使得運算簡便。
0.72×10.1
=0.72×(10+0.1)
=0.72×10+0.72×0.1
=7.2+0.072
=7.272
9樓:慕容家族創創大
公式1:a-b-c = a-(b+c)
10-0.432 -2.568
9.3-5.26-2.74
13.4-(3.4+5.2)
14.9-(5.2+4.9)
18.32-5.47-4.32
17.29-5.28-6.29
公式2:(axb)xc=ax(bxc)
25×6.8×0.04
0.25×32×0.125
6.4×1.25×12.5
公式3:c×(a+b)=ca+cb
0.45×201
0.58×10.1
50.2×99+50.2
4.7×9.9
3.28x5.7+6.72x5.7
2.1×99+2.1
1.7×9.9+0.17
23×0.1+2.3×9.9
0.18+4.26-0.18+4.26
0.58x1.3÷0.58x1.3
7.3÷4+2.7x0.25
3.75x0.5-2.75÷2
5.26x0.125+2.74÷8
公式4:a÷b÷c=a÷(b×c)
6.3÷1.8
4.2÷3.5
9.5÷(1.9 × 8)
12.8÷(0.4×1.6)
930÷0.6÷5
63.4÷2.5÷0.4
(7.7+1.54)÷0.7
(11.7+9.9)÷0.9
簡便計算:
100-0.99
10.99+9.87
4.089÷0.047
0.24×390
6.9+4.8+3.1
0.456+6.22+3.78
15.89+(6.75-5.89)
4.02+5.4+0.98
5.17-1.8-3.2
13.75-(3.75+6.48)
3.68+7.56-2.68
7.85+2.34-0.85+4.66
35.6-1.8-15.6-7.2
3.82+2.9+0.18+9.1
9.6+4.8-3.6
7.14-0.53-2.47
5.27+2.86-0.66+1.63
13.35-4.68+2.65
73.8-1.64-13.8-5.36
47.8-7.45+8.8
0.398+0.36+3.64
15.75+3.59-0.59+14.2566.86-8.66-1.34
0.25×16.2×4
(1.25-0.125)x8
3.6x102
3.72x3.5+6.28x3.5
36.8-3.9-6.1
4.8×7.8+78×0.52
32+4.9-0.9
4.8×100.1
56.5×9.9+56.5
7.09x10.8-0.8x7.09
25.48-(9.4-0.52)
4.2÷3.5
320÷1.25÷8
18.76×9.9+18.76
3.52÷2.5÷0.4
3.9-4.1+6.1-5.9
5.6÷3.5
9.6÷0.8÷0.4
4.2×99+4.2
17.8÷(1.78×4)
0.49÷1.4
1.25×2.5×32
3.65×10.1
15.2÷0.25÷4
0.89×100.1
146.5-(23+46.5)
3.83×4.56+3.83×5.44
4.36×12.5×8
9.7×99+9.7
27.5×3.7-7.5×3.7
8.54÷2.5÷0.4
0.65×101
3.2×0.25×12.5
7.2×0.2+2.4×1.4
8.9×1.01
7.74×(2.8-1.3)+1.5×2.263.9×2.7+3.9×7.3
18-1.8÷0.125÷0.8
12.7×9.9+1.27
21×(9.3-3.7)-5.6
15.02-6.8-1.02
5.4×11-5.4
2.3×16+2.3×23+2.3
9.43-(6.28-1.57)
3.65×4.7-36.5×0.37
46×57+23×86
13.7×0.25-3.7÷4
2.22×9.9+6.66×6.7
101×0.87-0.91×87
10.7×16.1-15.1×10.7
0.79×199
4.8+8.63+5.2+0.37
5.93+0.19+2.81
1.76+0.195+3.24
2.35+1.713+0.287+7.651.57+0.245+7.43
6.02+3.6+1.98
0.134+2.66+0.866
1.27+3.9+0.73+16.1
7.5+4.9-6.5
3.07-0.38-1.62
1.29+3.7+2.71+6.3
8-2.45-1.55
3.25+1.79-0.59+1.75
23.4-0.8-13.4-7.2
0.32×403
3.2+0.36+4.8+1.64
1.23+3.4-0.23+6.6
0.25×36
12.7-(3.7+0.84)
36.54-1.76-4.54
0.25×0.73×4
7.6×0.8+0.2×7.6
0.85×199
0.25×8.5×4
1.28×8.6+0.72×8.6
12.5×0.96×0.8
10.4-9.6×0.35
0.8×(4.3×1.25)
3.12+3.12×99
28.6×101-28.6
0.86×15.7-0.86×14.7
2.4×102
2.31×1.2×0.5
14-7.32-2.68
2.64+8.67+7.36+11.33
70÷28
(2.5-0.25)×0.4
9.16×1.5-0.5×9.16
3.6-3.6×0.5
63.4÷2.5÷0.4
4.9÷1.4
3.9÷(1.3×5)
(7.7+1.54)÷0.7
2.5×2.4
2.7÷45
15÷(0.15×0.4)
0.35×1.25×2×0.8
32.4×0.9+0.1×32.4
15÷0.25
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