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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

1-9分之2-9分之2递等式 1-9分之2-9分之2 =9分之9-9分之2-9分之2 =9分之(9-2-2) =9分之5

=(7/9-2/9)+(1/3+2/3) =5/9+1 =1又5/9

8又1/9-2又5/6-3又11/12 =8又1/9-(2又5/6+3又11/12) =8又1/9-6又3/4 =1又13/36

7/6-(7/6-7/9) =7/6-7/6+7/9 =7/9 9/10+5/6-3/4 =54/60+50/60-45/60 =59/60 1/2+1/6+1/12 =1-1/2+1/2-1/3+1/3-1/4 =1-1/4 =3/4 7/15+4/15+2/5+3/5 =11/15+1 =26/15

(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...

1. 4/9*15+5/9除以1/15 =4/9*15+5/9*15 =15*(4/9+5/9) =15*1 =15. 2. 9--(1/12+1/8)*24 =9--(1/12*24+1/8*24) =9--(2+3) =9--5 =4.

(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)...

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