按规律填数(计算前3题,再根据规律填写).30×9= 24×3= 22÷2= 400÷5=15×6= 4×25= 5×65= 75÷3=18×4= 3×231= 45×2= 800÷4=110×7= 5×600= 690÷3= 350÷7=
脱式计算,能简算的必须简算.12.5×0.25×320 4.57×0.36+4.57×0.64 103×2.478.6÷12.5÷0.8 48×0.25×5 15.72÷(3.8﹣3.2×0.75)
递等式计算(能简算的要简便计算).3.6÷(3.6+1.2), 26.18÷(5.2﹣3.5)+0.06 (31.6﹣11.7)÷2.5÷0.4[11÷(1﹣0.8)]÷0.1 20.12×48﹣201.2×1.4+2012×0.66.
递等式计算.(能简算的要简算)9.6÷0.4×0.25 29.7÷(5.85÷0.65)7.4×9.9 3.84﹣2.7×0.648.68﹣8.68÷0.56×0.5 4.7×4.7+4.7+4.3×4.7.
7.85﹣4.7+2.15﹣4.3193.2÷6.9﹣1.9×2.51.25×3.2×2.5×4.94.97×4.97+4.97×4.03+4.97(3.12+0.9)÷(8.5﹣5×1.1)[5+(17.9﹣1.74÷0.6)]×8.5.
计算,能简算的要简算10÷0.2÷2.5 8.4÷0.21÷0.5 1.25×3.2×0.2514.5×102 14.64+3.7×2.8 3.5×0.7+7.5×0.7﹣0.7.