1樓:匿名使用者
4.8×3.6+5.2×3.6
=(4.8+5.2)×3.6
=10×3.6
=36。
脫式計算(能簡便算可以簡便算)3.6乘以2.5
2樓:聚焦百態生活
可以通過乘法結合律逆運算進行簡便運算,脫式計算過程如下:
版3.6×2.5
=0.9×4×2.5
=0.9×(4×2.5)
=0.9×1
=0.9
3樓:肯定助你成功
3.6×2.5
=4×0.9×2.5
=(4×2.5)×0.9
=10×0.9=9
4樓:許華斌
9x0.4x2.5=9x1=9
脫式計算(能簡算的要用簡便方法計算): ①80÷(1-84%) ②5-5× 2 5 +
5樓:臥牛
①80÷(1-84%),
=80÷0.16,
=500;
②5-5×2 5
+3 5
,=5-2+3 5
,=33 5
;③0.25×32×12.5%,
=0.25×4×8×0.125,
=(0.25×4)×(8×0.125),
=1×1,
=1;④7 9
÷11 5
+2 9
×511
,=7 9
×511
+2 9
×511
,=(7 9
+2 9
)×511
,=1×5
11,=511.
6樓:冼棟屈嘉穎
解:①80÷(1-84%),
=80÷0.16,
=500;
②5-5×
25+35,
=5-2+35,
=335;
③0.25×32×12.5%,
=0.25×4×8×0.125,
=(0.25×4)×(8×0.125),
=1×1,
=1;④79÷115+29×511,
=79×511+29×511,
=(79+29)×511,
=1×511,
=511.
脫式計算(能簡便的要簡便計算) 4.5×5.2+4.5×4.8 8.8×1.25 0.4×(4.3×2.5) 60.8-1.7
7樓:手機使用者
(1)4.5×
5.2+4.5×4.8
=4.5×(5.2+4.8)
=4.5×10
=45;
(2)8.8×1.25
=(8+0.8)×1.25
=8×1.25+0.8×1.25
=10+1
=11;
(3)0.4×(4.3×2.5)
=4.3×(0.4×2.5)
=4.3×1
=4.3;
(4)60.8-1.75-1.25
=60.8-(1.75+1.25)
=60.8-3
=57.8;
(5)0.4×(4.3×2.5)
=4.3×(0.4×2.5)
=4.3×1
=4.3;
(6)45×10.1
=45×(10+0.1)
=45×10+45×0.1
=450+4.5
=454.5;
(7)0.63+0.42+0.37+9.58=(0.63+0.37)+(0.42+9.58)=1+10
=11;
(8)8.36×99+8.36
=8.36×(99+1)
=8.36×100
=836;
(9)0.78×99
=0.78×(100-1)
=0.78×100-0.78×1
=78-0.78
=77.22;
(10)90÷(3.6-1.8)
=90÷1.8
=50;
(11)36÷[(6.1-4.6)×0.8]=36÷[1.5×0.8]
=36÷1.2
=30;
(12)1.6×(2.25+10.5÷1.5)=1.6×(2.25+7)
=1.6×9.25
=14.8;
(13)12.75÷[14.6-(1.3+8.2)]=12.75÷[14.6-9.5]
=12.75÷5.1
=2.5;
(14)3.2+3.91÷(19-16.7)=3.2+3.91÷2.3
=3.2+1.7
=4.9.
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