21.73+(7.02﹣1.73)+1.98 312﹣12×16+24 40﹣4.72+5.28 57×39﹣39+39×44 9000÷36 30﹣[17.8+(6.2+38÷10)].
计算下面各题. 3.52+8.4+2.6 5.94+6.7+1.06+0.3 42.24﹣6.24﹣3.76 4.92+3.27﹣4.92+3.73.
8.4×2.5+7.18 5.81﹣0.25×1.6 0.8×630×0.125.
3.5×4.8+2.2×2.4.
脱式计算 9.3÷0.5÷2.4 37.6﹣1.5÷0.24 4.8÷1.2×2.3﹣9.2 1.6÷0.8﹣0.34.
脱式计算.(能简算的要简算) 17.68÷5.2+3.4 30.6×1.5÷5.1 3.2×2.08﹣0.6 3.8÷2.5÷4.