这些用简便计算怎么做?(1)99*0.43 (2)6.11-7/32-(1又4/11*8/15+1又4/11*7/15)

问题描述:

这些用简便计算怎么做?(1)99*0.43 (2)6.11-7/32-(1又4/11*8/15+1又4/11*7/15)

1,99*0.43=(100-1)*0.43=43-0.43=42.57
2.不知道你题目有没有输入对
6.11-7/32-(1又4/11*8/15+1又4/11*7/15)=6.11-7/32-(15/11*8/15+15/11*7/15)
=6.11-7/32-(8/11+7/11)
=6.11-7/32-15/11
后面的只能用常规算法了
你看下题目是不是抄错了

(1)99*0.43
=0.43*(100-1)
=0.43*100-0.43*1
=43-0.43
=42.57
(2)6.11-7/32-(1又4/11*8/15+1又4/11*7/15)
=6.11-7/32-[1又4/11*(8/15+7/15)]
=6.11-7/32-15/11