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脱式计算,能简算的要简算.2.31×1.5+1.5×7.69 23....

(1)2.31×1.5+1.5×7.69=(2.31+7.69)×1.5=10×1.5=15;(2)23.4÷7.8-2.1=3-2.1=0.9;(3)4.5×0.4÷4.5×0.4=4.5÷4.5×0.4×0.4=1×0.4×0.4=0.16;(4)6.4×101-6.4=6.4×(101-1)=6.4×100=640;(5)4×1.98×0.25=4×0.25×1.98=1×1.98=1.98;(6)7...

1.5乘23+1的和

(1)2.31×1.5+1.5×7.69=(2.31+7.69)×1.5=10×1.5=15;(2)23.4÷7.8-2.1=3-2.1=0.9;(3)4.5×0.4÷4.5×0.4=4.5÷4.5×0.4×0.4=1×0.4×0.4=0.16;(4)6.4×101-6.4=6.4×(101-1)=6.4×100=640;(5)4×1.98×0.25=4×0.25×1.98=1×1.98=1.98;(6)7....

根据题意可得:(1)2.31×1.5+1.5×7.69,=(2.31+7.69)×1.5,=10×1.5,=15;(2)23.4÷7.8-2.1,=3-2.1,=0.9;(3)6.4×101-6.4,=6.4×(101-1),=6.4×100,=640;(4)4×1.98×0.25,=4×0.25×1.98,=1×1.98,=1.98.

(1)8.3-2.4×1.5,=8.3-3.6,=4.7;(2)23.4÷7.8+2.1,=3+2.1,=5.1;(3)2.5×6.3+2.5×3.7,=2.5×(6.3+3.7),=2.5×10,=25;(4)1.25×2.3×0.8,=1.25×0.8×2.3,=1×2.3,=2.3.

(1)8.3-2.4×1.5,=8.3-3.6,=4.7;(2)23.4÷7.8+2.1,=3+2.1,=5.1;(3)2.5×6.3+2.5×3.7,=2.5×(6.3+3.7),=2.5×10,=25;(4)1.25×2.3×0.8,=1.25×0.8×2.3,=1×2.3,=2.3.

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