减去所得的差与相加,和是多少?
简便计算①4.05﹣2.86﹣0.14②7×+0.4×7③2.25×3.14×4+3.14④(﹣)×17×15.
简算0.45×201 1.6×55.4﹣55.4×0.6 5.8+2.49+8.51+4.2 1.25×0.32×2.5.
计算下面各题,能简算的要简算1243﹣1334÷23×12 2×3.14×8×5+3.14×82 8.86﹣5.29﹣1.71﹣1.86+(1﹣)×÷ 85×0.75+16×75%﹣.
1998÷199819981998 1431×23+2331×17+3125:6=x:4.5 5(x﹣4)﹣6=2(x﹣4)
简算:①57.5﹣14.25﹣15 ②102.31×59③(×10.68+8.52×)÷1 ④0.1+0.2+0.3+0.4+…+0.9+0.1+0.11+0.12+…+0.98+0.99.