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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...

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)5.5×17.3+6.7×5.5=5.5×(17.3+6.7)=5.5×24=132;(2)1.5×105=1.5×(100+5)=1.5×100+1.5×5=150+7.5=157.5;(3)9.07-22.78÷3.4=9.07-6.7=2.37;(4)3.8+4.29+2.1+4.2=(3.8+4.2)+(4.29+2.1)=8+6.39=14.39;(5)2.65×1.7+1.35×1.7=...

(1)9.9+1.2-9.9+1.5=9.9-9.9+1.5+1.2=0+1.5+1.2=2.7 (2)10-3.45+2.55=6.55+2.55=9.1 (3)5.58+2.74-1.58=5.58-1.58+2.74=4+2.74=6.74 (4)1.5×10.2=1.5×10+1.5×0.2=15+0.3=15.3 (5)3.8+3.22÷23×13=3.8+0.14×13=3.8+1.82=5.62 (6)10×2....

(1)0.125×9.3×0.8,=0.125×0.8×9.3,=0.1×9.3,=0.93;(2)9.83×1.5+1.5×0.17,=(9.83+0.17)×1.5,=10×1.5,=15;(3)(12+23.1÷0.75)×0.4,=(12+30.8)×0.4,=42.8×0.4,=17.12;(4)2.8×10.1,=2.8×(10+0.1),=2.8×10+2.8×0.1,=2...

(1)5.5×13.3+6.7×5.5=5.5×(13.3+6.7)=5.5×20=110;(2)3.69÷(1.23×1.5)=3.69÷1.23÷1.5=3÷1.5=2;(3)1.25×50×0.2×0.8=(1.25×0.8)×(50×0.2)=1×10=10;(4)3.78×0.25+2.58=0.945+2.58=3.525;(5)9.09-22.78÷3.4=9.09-6.7=2.39;(6...

(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.

(1)(1.5+23)÷16-23=(32+23)×6-23=136×6-23=13-23=1213;(2)35×3.7+0.6+5.3×60%=0.6×3.7+0.6+5.3×0.6=0.6×(3.7+1+5.3)=0.6×10=6;(3)9.81×0.1+0.5×98.1+0.049×981=9.81×0.1+5×9.81+4.9×9.81=9.81×(0.1+5+4.9)=9.81×10=98.1;(4)1...

1.5乘23+1的和

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