看谁算得又对又快85﹣38= 50×9= 0×7= 200×5= 800﹣610=400×8= 650+480= 54÷9= 93÷9= ﹣=+= 1﹣= 8×9+9= 1时﹣20分= 分 4吨+3吨= 千克.
用递等式计算,能简算的要简算.1÷﹙18.5﹣4.5×3﹚÷﹣×××40.
计算下面各题(能简算的要简算).①4×0.8×2.5×12.5 ②÷[1﹣(+)] ③(2.8+3.85÷3.5)×4.6 ④6.5×1.83+0.17×6.5 ⑤(+)×8+ ⑥÷[×(0.4+)].
0.89×0.48+0.89×0.52 0.25×13.7×0.4 4.2×1013.6×99 2.5×32×1.25 0.125×8856.5×99+56.5 (1.25﹣0.125)×8 45÷0.09÷0.517.8÷(1.78×4)
计算下列各题.(能简算的要简算).91÷2.6÷0.05= 6.3×3.7+6.3×6.3= (3.7+1.7×0.4)÷2.5=7.28+3.2÷2.5= 0.74+0.9×7.4= 7.8÷0.125÷0.8=
计算下面各题,能用简便算法的用简便算法3.045+2.7×6.9= 18.94﹣2.5×4=3.65×2.8+3.65×7.2= 13.54×102﹣2×13.54=