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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)5.5×17.3+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)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)(+16)+(-12)=4;(2)(-1.5)+12-(-35)-0.2=-1.5+12+35-0.2=-0.6;(3)(23?14?38)×(-24)=-16+6+9=-1;(4)|-5-4|-5×(-4)÷(-12)=9-40=-31;(5)(?58)×(?42)?0.25×(?8)×(?1)2007=-58×(-16)+2×(-1)=10-2=8.

1、7/108 2、150/529 3、96/375

7.74×(2.8-1.3)+1.5×2.26 =7.74×1.5+1.5×2.26 =1.5x(7.74+2.26) =1.5x10 =15

1.5*0.4*23=怎么简便计算? 1.5*0.4*23 =0.6*23 =13.8 直接计算

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