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2.6*1.9/2.6*1.9递等式计算

5/9-(2/9+1/6) =5/9-2/9-1/6 =1/3-1/6 =2/6-1/6 =1/6

=(7/9-2/9)+(1/3+2/3) =5/9+1 =1又5/9

(1)50.4×1.9-1.9=50.4×1.9-1.9×1=(50.4-1)×1.9=49.4×1.9=93.86;(2)44.28÷0.9÷4.1=49.2÷4.1=12;(3)1.25×32×0.25=(1.25×8)×(4×0.25)=10×1=10;(4)8.6×9.9=8.6×(10-0.1)=8.6×10-8.6×0.1=86-0.86=85.14;(5)18÷2.5÷0.4=18÷(2....

(1)9.9×101-9.9=9.9×(101-1)=9.9×100=990;(2)0.25×8÷20-0.78÷7.8=2÷20-0.78÷7.8=0.1-0.1=0;(3)2.5×3.2×1.25=2.5×(4×0.8)×1.25=(2.5×4)×(0.8×1.25)=10×1=10;(4)(12.5-5÷2.5)×0.8+1.6=(12.5-2)×0.8+1.6=10.5×0.8+1.6=8.4+1...

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 12. 6 ×( 1/2 + 2/3...

(1)20.4×1.9-1.8=38.76-1.8=36.96;(2)18.1×0.92+3.93=16.652+3.93=20.582; (3)(7.2-2)×1.2=5.2×1.2=6.24;(4)1.25×0.7×0.8=1.25×0.8×0.7=1×0.7=0.7; (5)1.2×2.5+0.8×2.5=(1.2+0.8)×2.5=2×2.5=5; (6)4×7.8×2.5=7.8×(4×2.5)...

原式 =(1+95)+(2+94)+……+(25+71) =96+96+……+96 =96x25 =(24x4)x25 =24x(4x25) =24x100 =2400 供参考。

(1+10)X10/2=55

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