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7.28×1.5+7.28×8.5简便计算

7.28x1.5+7.28x8.5=7.28x(1.5+8.5)=7.28x10=72.8

(1)5.4×0.75÷1.5=4.05÷1.5=2.7(2)7.28+3.2÷1.6=7.28+2=9.28(3)101×0.45=(100+1)×0.45=100×0.45+0.45=45+0.45=45.45(4)3.8+4.59+0.41+6.2=(3.8+6.2)+(4.59+0.41)=10+5=15

7.28_2.28×1.5用简便方法计算 =7.28×(1-1.5) =7.28×(-0.5) =3.64

应该是小数点点错了,没有简便算法。 15×7.28-2.28×1.5 =1.5×72.8-2.28×1.5 =1.5×(72.8-2.28) =1.5×70.52 =105.78

7.28减2.28乘1.5用简便方法计算 =7.28-2.28-2.28x0.5 =5-1.14 =3.86

7.28-2.28*1.5 =7.28-1.14*3 =7.28-3.42 =3.86

用简便方法计算 7.28-2.28×1.5 =7.28-2.28-2.28x0.5 =5-1.14 =3.86

解:采用分配律和拆分法, 原式=7.28-2.28x1.5 =5+2.28-2.28x1.5 =5-2.28x(1.5-1) =5-2.28x0.5 =5-1.14 =3.86

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