计算,能简算的要简算112﹣12× (+)×32 25×+9×××16 +× 17×.
怎样简便就怎样算25×125×8×40 52×66+34×52 27+428+173+72 45×101.
200.2×6.37+1001×0.04+20.02×34.3.
用乘法分配律,结合律、交换律计算以下各题:25×19×4 (25×125)×(8×40) 35×39+65×39 36×199+36
简便计算.0.28×1020.175÷0.25÷0.47.09×9.2+0.8×7.0911.8﹣2.08﹣3.724.8×0.2×0.53.72×3.5+6.28×3.5.
用简便方法计算①4×9×25 ②139×5×2 ③(40+8)×5 ④45×98+55×98.