49分之22/(4分之1+7分之1)*28简便计算

问题描述:

49分之22/(4分之1+7分之1)*28简便计算
快:::

22/49 ÷(1/4+1/7)×28
=22/49 ÷ [(7+4)/28] ×28
=22/49 ÷ 11/28 ×28
=22/49×28/11×28
=(2×28×28)/49
=(2×28×28)/(7×7)
=(2×4×4×7×7)/(7×7)
=2×4×4=32