(30%乘以40%加68%的和乘以一加40%的和等于多少?

问题描述:

(30%乘以40%加68%的和乘以一加40%的和等于多少?

1.20

是(30%×40%+68%)×(1+40%)吧?
  原式=(12%+68%)×1.4
  =0.8×1.4
  =1.12