计算下面各题,能简算的要简算.4.05﹣2.8﹣0.7 1.25×32×2.5 [1﹣(﹣)]× 99.9×98+(0.8﹣)×999.
选用合适的方法计算下面各题200.9×10%+2.009×490+0.2009×5000 [﹣(﹣)]×(++)×24 +++++++.
看谁算得巧.①75.5﹣8.25﹣12.75 ②÷[×(0.5+)] ③43﹣43×0.9 ④÷﹣×6.
73.66++26.34++.
用自己喜欢的方法计算下面各题.57.5﹣4.25﹣15.75 (+)×8+ 4.5﹣(+1.5)﹣125×32 ×16.31﹣2.31÷ (+×)÷.
下列各题能简算的要简算.3.1+2.4+1.9+3.6 300﹣288÷24 48×(+) 0.46×98+0.92×÷× 21÷(+)÷.