1樓:
(zhi1)25.4×1.25×0.8
=25.4×(12.5×0.8)
=25.4×dao10
=254;專
(屬2)3.9÷2×(4.94-3.64)=1.95×1.3
=2.535;
(3)38.4÷0.25÷4
=38.4÷(0.25×4)
=38.4÷1
=38.4;
(4)3.47÷(3.47×4 )
=3.47÷3.47÷4
=1÷4
=0.25;
(5)1.25×4.6×8
=(1.25×8)×4.6
=10×4.6
=46;
(6)(0.8+8)×0.125
=0.8×0.125+8×0.125
=0.1+1
=1.1.
脫式計算.(能簡算的用簡算)(1)25×4.4(2)7.7×0.16÷7.7×12.5 (3)10.64÷(3.7-2.9)(4)4.8
2樓:手機使用者
(1)25×
4.4,
=25×4+25×0.4,
=100+10,
=110;
(2)7.7×0.16÷7.7×12.5,=7.7÷7.7×0.8×0.2×12.5,=1×0.2×12.5×0.8,
=0.2×10,
=2;(3)10.64÷(3.7-2.9),=10.64÷0.8,
=13.3;
(4)4.8×99+4.8,
=4.8×(99+1),
=4.8×100,
=480;
(5)47.3+21×(3.9-0.87),=47.3+21×3.03,
=47.3+63.63,
=110.93;
(6)5×[(68.41-32.17)÷0.4],=5×(36.24÷0.4)
=5×90.6,
=453.
脫式計算(能簡算的用簡便演算法).(1)[9.2+0.8×(9-7.75)]÷0.4; (2)3.5×9.8+0.35×2;(3)
3樓:寧負迅昭
(1)[9.2+0.8×(
9-7.75)]÷0.4
=[9.2+0.8×1.25]÷4
=[9.2+1]÷4
=2.55
(2)3.5×9.8+0.35×2
=3.5×(9.8+0.2)
=3.5×10
=35(3)28×26
27=(27+1)×
2627
=27×26
27+26
27=26+26
27=2626
27(4)[(23-3
5)×154+2
3]÷11
12=[1
15×154+2
3]÷11
12=[14+2
3]÷11
12=11
12×12
11=1
脫式計算.(能簡算的要簡算) 0.125×0.25×8×4 [5-1.7÷(2-1)]×1 87×386 49÷(79+49)×114
4樓:手機使用者
(1)0.125×
源0.25×8×4,
=(0.125×8)×(0.25×4),
=1×1,
=1;(2)[5-1.7÷(2-1)]×1,=[5-1.7÷1]×1,
=[5-1.7]×1,
=3.3×1,
=3.3;
(3)87×386,
=(86+1)×386,
=86×3
86+1×386,
=3+386,
=3386
;(4)4
9÷(79+4
9)×114,
=49÷119
×114,=4
11×114,
=1;(5)3.9÷1.5-2.3×0.5,=2.6-1.15,
=1.45;
(6)112÷3
4-58×1635,
=2-27,
=157.
脫式計算(能簡算的要簡算
5樓:軒胤
(1)6.72-2.3÷0.5×0.8
=6.72-4.6×0.8
=6.72-3.68
=3.04;
(2)98-1
7+18-6
7=(98+1
8)-(17+6
7)=54
-1=14;
(3)9
10÷[1
2×(65-3
10)]
=910
÷[12
×910]=9
10÷9
20=2;
(4)(27+1
5)×7×5=27
×7×5+1
5×7×5
=10+7
=17.
遞等式計算(能簡就簡) 2÷0.25-0.25÷2 2.5×(4-0.8)×1.25 (3.
6樓:匿名使用者
2÷du0.25-0.25÷2
=8—0.125
=7.875
2.5×
zhi(dao4-0.8)×
專1.25
=(2.5×0.4)×(1.25×8)
=10。
(3.2×0.6÷屬3.2×0.6)÷1.2=(3.2÷3.2)×(0.6×0.6÷1.2)=0.3
脫式計算(能簡算的要簡算)4.36×12.5×8;15.2÷0.25÷4;0.
7樓:胤胤胤
(bai1)4.36×du12.5×8
=4.36×(12.5×8)
=4.36×100
=436;
(zhi2)15.2÷dao0.25÷4
=15.2÷(
0.25×4)
=15.2÷1
=15.2;
(3)0.46×1.9+0.54×1.9
=(0.46+0.54)×
內1.9
=1×1.9
=1.9;
(4)3.6÷[(1.2-0.4)×0.5]=3.6÷[0.8×0.5]
=3.6÷0.4
=9.容
8樓:匿名使用者
先算12.5*8=100*4.36=436
15.2/0.25/4=15.2*(0.25*4)=12.5
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