下面各题,能用简算的要用简便计算.1.85×2.5+2.15×2.581.99÷0.9×0.1718.26﹣2.35﹣4.651.25×32×0.2531.6÷1.25÷84.2÷0.7÷621.63﹣13.8×0.156.3÷3.5.
999×99+99.
(708﹣380)×302.
(1)25×24(2)450÷5÷9(3)201×24(4)94×57+57×6.
用递等式计算,能简算的要简算. 135÷27+12×41620﹣1320÷60+80(85+14×5)÷5 520÷[13×(43﹣33)]490÷[210÷(360÷12)][160﹣(75+38)]×107 45+61+39+5525×5×4×2 125×(8×5)×7.
用递等式计算,能巧算的要巧算. 529+736+471 915+782﹣315 83×501+73 (1237+2331÷37)÷20.