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脱式计算(能简算的要简算)( 1 4 + ...

(1)2.5×7.1×4=(2.5×4)×7.1=10×7.1=71(2)16.12×99+16.12 =16.12×(99+1)=16.12×100=1612(3)5.2×0.9+0.9×4.8=(5.2+4.8)×0.9=10×0.9=9(4)26×15.7+15.7×24 =(26+24)×15.7=50×15.7=785(5)(2.275+0.625)×0.28=2.9×0.28=0.812(6)6...

(1/6+1/9-1/12)×36 = 1/6 ×36 +1/9 × 36 -1/12×36 =6+4-3 =7

7分之12—(7分之5+2分之1) =12/7-5/7-1/2 =7/7-1/2 =1-1/2 =1/2 [1—(4分之1+8分之3)]除以4分之1 =(1-1/4-3/8)x4 =1x4-1/4x4-3/8x4 =4-1-3/2 =3-3/2 =3/2 =1又1/2 8分之1 x 58+8分之1 x 42 =1/8x(58+42) =1/8x100 =100/8 =12又1/2 5分之4 x ...

(1)807×99+807,=807×(99+1),=807×100,=80700;(2) 25× 1 3 × 2 5 × 3 10 ,=(25× 2 5 )×( 1 3 × 3 10 ),=10× 1 10 ,=1;(3)0.6+3.1+5.4+6.9,=(0.6+5.4)+(3.1+6.9),=6+10,=16;(4) [1-( I 2 - 1 4 )]× 2 5 ,=[1- 1 4...

五分之四加(八分之三减四分之一)脱式计算能简算的要简算 五分之四加(八分之三减四分之一) =4/5+3/8-1/4 =32/40+15/40-10/40 =(32+15-10)/40 =37/40

(1)496-23×16,=496-368,=128;(2)2.9×3.6+2.9×6.4,=(3.6+6.4)×2.9,=10×2.9,=29;(3)[1-( 1 3 + 1 4 )]×24,=[1- 7 12 ]×24,= 5 12 ×24,=10.

(1)6.72-2.3÷0.5×0.8=6.72-4.6×0.8=6.72-3.68=3.04;(2)98-17+18-67=(98+18)-(17+67)=54-1=14;(3)910÷[12×(65-310)]=910÷[12×910]=910÷920=2;(4)(27+15)×7×5=27×7×5+15×7×5=10+7=17.

0.625×5.8+5/8×3.2+62.5% =0.625x5.8+0.625x3.2+0.625 =0.625x(5.8+3.2+1) =0.625x10 =62.5; 2017×2015/2016 =(2016+1)x2015/216 =2016x2015/2016+1x2015/2016 =2015+2015/2016 =2015又2015/2016; (1/2+1/3+1/6)x24 =1/2x24+1/3x24+1/6x24 =1...

我擦,这么多,我。。。。先去散散步

(1)17.64÷4.9+6.73=3.6+6.73=10.33(2)5.6×13.9+0.44×139=0.56×139+0.44×139=(0.56+0.44)×139=1×139=139(3)48×1.02÷3.4=48.96÷3.4=14.4(4)0.25×12.5×320=0.25×12.5×8×40=(0.25×40)×(12.5×8)=10×100=1000

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