2.5×4 (3.4×2.5×4.2)÷(0.5×0.7×1.7)的简便运算

(3.4×2.5×4.2)÷(0.5×0.7×1.7)的简便运算  

(3.4×2.5×4.2)÷(0.5×0.7×1.7)的简便运算

(3.4×2.5×4.2)÷(0.5×0.7×1.7)的简便运
(3.4×2.5×4.2)÷(0.5×0.7×1.7)
=(3.4÷1.7)*（2.5÷0.5）*（4.2÷0.7）
=2*5*6
=60

简便运算5.42-4.2+1.7

5.42-4.2+1.7
=1.02+1.7
=2.72
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0.56x0.7+4.2简便运算

4.2*1.2-5.2*0.7
=0.7*6*1.2-5.2*0.7
=0.7*7.2-5.2*0.7
=0.7*(7.2-5.2)
=0.7*2
=1.4

24×[(o.8 3.4)÷0.7]简便运算

解：原是=24x[(0.8+3.4)/0.7]
=24x6
=144
答：答案是144.

12.5÷0.5-2.5÷0.5简便运算

12.5÷0.5-2.5÷0.5
=(12.5-2.5)÷0.5
=10÷0.5
=20
或
12.5÷0.5-2.5÷0.5
=12.5×2-2.5×2
=(12.5-2.5)×2
=10×2
=20

51×68×78÷(1.7×3.4×1.3)的简便运算

原式
=51x68x78÷1.7÷3.4÷1.3
=(51÷1.7)x(68÷1.7)x(78÷1.3)
=30x40x60
=1200x60
=72000
供参考。

8.5÷2.5×101-3.4简便运算

8.5÷2.5×101-3.4
=（8.5×4）÷（2.5×4）×101-3.4
=34÷10×101-3.4
=3.4×101-3.4
=3.4×（101-1）
=3.4×100
=340

3.4÷2.5的简便运算法

3.4÷2.5的简便运算法
=（3.4×4）÷（2.5×4）
=13.6÷10
=1.36

4.25÷2.5×99+1.7简便运算

4.25÷2.5×99+1.7
=（4.25×4）÷（2.5×4）×99+1.7
=17÷10×99+1.7
=1.7×99+1.7×1
=1.7×（99+1）
=1.7×100
=170