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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...

2又6分之1减4分之3减3分之2等于多少? 13/6 - 3/4 - 2/3 = 26/12 - 9/12 -8/12 =(26-9-8)/12 =9/12 =3/4

(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,=0.9×(5.2+4.8),=0.9×10,=9;(4)[113-(34.15+38.25)]÷2,=[113-72.4]÷2,=40.6÷2,=20.3;(5)3.6÷...

(1)44×25,=11×(4×25),根据乘法结合律,=11×100,=1100;(2)(1- 1 4 - 5 12 )÷ 2 3 ,=(1- 3 12 - 5 12 ) ÷ 2 3 ,= 1 3 × 3 2 ,= 1 2 ;(3) 3 5 ×12+ 3 5 ×14- 3 5 ,= 3 5 × (12+14-1),= 3 5 × 25,=15;(4) 4 9 ×[ 3 4 -...

(1)[1-(14+18)]×32,=1×32-14×32-18×32,=32-8-4,=20;(2)2.5×28,=(2.5×4)×7,=10×7,=70;(3)53-2137?1637,=53?(2137+1637),=53?1,=23.

(1)67÷[(47-12)×25]=67÷[114×25]=67÷135=67×35=30;(2)1415×25%-1115÷4=1415×14-1115×14=(1415-1115)×14=15×14=120;(3)1.28×2.37-2.8×0.237=1.28×2.37-0.28×2.37=(1.28-0.28)×2.37=1×2.37=2.37;(4)(512+119)×12+719=512×12+11...

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)2007-6×308 =2007-1848=159(2)1750-999-99-9 =1750-(1000-1)-(100-1)-(10-1)=1750-1000-100-10+3=750-100-10+3=650-10+3=640+3=643(3)0.7+3.9+4.3+6.1=(0.7+4.3)+(3.9+6.1)=5+10=15(4)3.6÷(7.2-4×1.5)=3.6÷(7.2-6)=3.6...

(100+1)×0.45 =100×0.45+1×0.45 =45+0.45 =45.45

5/8x3/4 + 1/4ⅹ5/8 =(3/4 +1/4)×5/8 =5/8

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