若7A=5B、，则A、B、成反比例． ．
53×46+54×53．
计算，能简算的要简算4%×99+0.04 75%×25+175× （+）×40．
用简便方法计算下面各题．43.6+9.8+6.4 17.3×0.25×8 2.31×1.5+1.5×7.69．
怎样简便就怎样算．4.3+0.98+0.7= 5.27﹣3.9﹣0.1= 8.44﹣（5.44+2.8）= 4.9+0.1﹣4.9+0.1=
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