递等式计算（能简则简）
问题描述：
递等式计算（能简则简）
0.32+0.68*3.5
2.5*（0.4+0.8）*12.5
52*7.5-490*0.75-7.5
2.5*（1.6/2.5/0.04）
答
0.32+0.68X3.5 2.5X（0.4+0.8）X12.5
=0.16X2+0.16X4X3.5 =(2.5X0.4)X12.5+2.5X(0.8X12.5)
=0.16X2+0.16X14 =12.5+25
=0.16X16 =37.5
=2.56
52X7.5-490X0.75-7.5 2.5X（1.6/2.5/0.04）
=52X7.5-49X7.5-7.5X1 =2.5X(1.6/(2.5X0.04)
=7.5X(52-49-1) =2.5X(1.6/0.1)
=7.5X2 =2.5X16
=15 =2.5X4X4
=40