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脱式计算,能简算的要简算,需要过程

7/12+7/8-3/4 =7/12+7/8-6/8 =7/12+1/8 =14/24+3/24 =17/24

(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...

(3-½)÷(¼+2) =5/2÷9/4 =5/2×4/9 =10/9 9-(1/12+1/8)×24 =9-(2+3) =9-5 =4

1.3/7 × 49/9 - 4/3 2. 8/9 × 15/36 + 1/27 3. 12× 5/6 – 2/9 ×3 4. 8× 5/4 + 1/4 5. 6÷ 3/8 – 3/8 ÷6 6. 4/7 × 5/9 + 3/7 × 5/9 7. 5/2 -( 3/2 + 4/5 ) 8. 7/8 + ( 1/8 + 1/9 ) 9. 9 × 5/6 + 5/6 10. 3/4 × 8/9 - 1/3 11. 7 × 5/49 + 3/14 ...

0.4×125×25×0.8 =(0.4×25)×(125×0.8) =10×100=1000 1.25×(8+10) =1.25×8+1.25×10 =10+12.5=22.5 9123-(123+8.8) =9123-123-8.8 =9000-8.8 =8991.2 1.24×8.3+8.3×1.76 =8.3×(1.24+1.76) =8.3×3=24.9 9999×1001 =9999×(1000+1) =9999×...

①(84×27-2166)÷17,=(2268-2166)÷17,=102÷17,=6;②115×3.7+5.3÷511+2.2,=2.2×3.7+5.3×2.2+2.2,=2.2×(3.7+5.3+1),=2.2×10,=22;③(0.75÷3-0.1)×(1-23),=(0.25-0.1)×13,=0.15×13,=0.05.

解(1)20-9.18-0.82,=20-(9.18+0.82),=20-10,=10.(2)6.53-(1.53+2.6),=6.53-1.53-2.6,=4-2.6,=1.4.(3)5.52-1.074-0.926,=5.52-(1.074+0.926),=5.52-2,=3.52.(4)4.21+1.04+0.79,=4.21+0.79+1.04,=5+1.04,=6.04.

(1)153÷45+6.6=3.4+6.6,、=10;(2)(14+18+112)×24=14×24+18×24+112×24,=6+3+2,=11;(3)3.6×[2÷(45?0.6)].=3.6×[2÷(0.8-0.6)],=3.6×[2÷0.2],=3.6×10,=36.

第一题=3/4乘以5/7乘以4/3减去1/2=5/7减去1/2=分子:10减去7 分母:14=3/14 第二题=3.14乘以16减去3.14乘以6=3.14乘以(16减去6)=3.14乘以10=31.4 第三题=10减去【1/5减去(7/20减去1/10)乘以1/5】=10减去1/5乘以【1减去(7/20减去1/10)】=10...

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