下面的题目你能用简便算法计算吗?0.85+2.7+15% 37×0.39-27×39%

你是小学的吧？
0.85+2.7+15%=85%+2.7+15%=3.7
同理37×0.39-27×39%=(37-27)×0.39=3.9

0.85+2.7+15% =（0.85+0.15）+2.7=0.2+2.7=2.9
37×0.39-27×39%=37X0.39-27x0.39=0.39x(37-27)=0.39X10=3,9

0.85+2.7+15%
=0.85+2.7+0.15
=1+2.7
=3.7

37×0.39-27×39%
=37*0.39-27*0.39
=0.39*(37-27)
=0.39*10
=3.9