(2.7+12.5)÷0.5-5.6 1.25×16-0.6×25+65
简便计算 0.49×12.5×0.8; 5.61﹣5.61÷1.5; 0.45×78.2+20.8×0.45+0.45.
竖式计算0.56×7.2=2.46÷8.2=5.202÷0.51=
口算:
求出下面图形的面积.
计算下面各题(能简算的要简算).2.16÷(2.84+7.96)×0.837×9.9945.7×3.9+5.43×39[20.08+(32﹣29.9÷23)]÷2.