Question

五分之九乘五分之一加五分之一乘四分之一减五分之一怎么简便计算？

Answer 1

五分之九乘五分之一加五分之一乘四分之一减五分之一怎么简便计算？
这道题目的简单方法计算：先提取公因数1/5再计算较为简单：
9/5×1/5+1/5×1/4-1/5
=(9/5+1/4-1)*1/5

=(4/5+1/4)*1/5
=（0.8+0.25）*1/5
=1.05*0.2

=0.21

Answer 2

9/5*1/5+1/5*1/4-1/5
运用乘法分配律简便计算
=1/5*（9/5+1/4-1/5）
=1/5*（9/5-1/5+1/4）
=1/5*（8/5+1/4）
=1/5*（32+5）/20
=1/5*37/20
=37/100

Answer 3

9/5*1/5+1/5*1/4-1/5
=1/5*（9/5+1/4-1）
=（4/5+1/4）/5
=（0.8+0.25）/5
=0.21

Answer 4

9/5×1/5+1/5×1/4-1/5=(9/5+1/4-1)×1/5=(4/5+1/4)×1/5=1.05÷5=0.21

Answer 5

5/9×1/5+1/5*1/4-1/5
=1/9+1/5×(1/4-1)
=1/9+1/5×(-3/4)
=1/9-3/20
=20/180-27/180
=-7/180