三道简便计算

3/5×(20＋5/6)
=3/5×20＋3/5×5/6
=12+1/2
=25/2

5/9÷5/12＋4/9÷5/12
=(5/9+4/9)÷5/12
=1÷5/12
=1×12/5
=12/5

63×37/62
=(62+1)×37/62
=62×37/62+1×37/62
=37+37/62
=37又37/62

晕,你太懒了,拿计算器自己算吧,晕死

1.直接乘进去 3/5*20+(3/5)*(5/6)=12.5
2.合起来再除 (5/9+4/9)/(5/12)=12/5=2.4
3.把63拆开 (62+1)*(37/62)=37+37/62 (读为37又62分之1,电脑上写怕你误会,所以有个加号)

3/5*20+3/5*5/6=12+1/2=12.5
(5/9+4/9)/(5/12)=5/12

你几岁了啊？不用计算器就能看出来！
=（3/5）*20+（3/5）*（5/6）=12+0.5=12.5
=（4/9+5/9）*5/12=5/12
=（62+1）*37/62=37+37/62