题型突破卷４计算题(二)专项4：脱式计算1．同级运算。7.28×1.5÷2.63.48×1.5÷2.42．四则混合运算。3.2×(3.5－2.1)÷77.2÷[5×(1.3＋0.5)]3．整数运算定律推广到小数。(1)交换结合凑整。0.4×6.9×2.58.26×1.25×0.83.9×2.5÷3.9×2.5(2)乘法分配律。4.65×2.4－4.65×1.6(2.5＋1.25)×0.4(3)拆分。6.25×10.199×6.451.25×8.81.25×3.2×2.5(4)抵消、除法的性质。9.25÷0.02÷500.4×5÷0.4×5(5)变形提取公因数。6.5×2.8＋6.2×6.5＋6.56.25×101－6.25(6)移动小数点使计算简便。0.085＋9.9×0.8528.9×1.4＋0.96×289－2.89×10(7)变除法为乘法。0.28÷0.250.12÷0.125(8)区分除法中的简算。56.3÷0.71＋14.7÷0.7115.8÷0.2＋15.8÷0.8答案1．4.22.1752．0.640.83．(1)6.98.266.25(2)3.721.5(3)63.125638.551110(4)9.2525(5)65625(6)8.5289(7)1.120.96(8)10098.75
