数一数并比较大小。
简算 0.45×201 1.6×55.4﹣55.4×0.6 5.8+2.49+8.51+4.21.25×0.32×2.5.
计算下面各题,能简算的要简算 1243﹣1334÷23×122×3.14×8×5+3.14×828.86﹣5.29﹣1.71﹣1.86+(1﹣)×÷85×0.75+16×75%﹣.
1998÷1998199819981431×23+2331×17+31 25:6=x:4.55(x﹣4)﹣6=2(x﹣4)
简算: ①57.5﹣14.25﹣15②102.31×59 ③(×10.68+8.52×)÷1④0.1+0.2+0.3+0.4+…+0.9+0.1+0.11+0.12+…+0.98+0.99.
计算下面各题,能简算的要简算. 4﹣+2.01×1001﹣2.01(+)÷×[1÷(﹣)]2+1÷(1﹣)