直接写得数. 3.14×25= 32÷40%= 789+198= 4521÷51≈(估算)÷= 3﹣﹣= 1÷0.01﹣10= ×9÷=
计算下面各题,能简算的要简算.7.28++2.72+ (+)÷ 168.1÷(4.3×2﹣0.4)36×+36×0.375 +÷.
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)