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2.6*1.9/2.6*1.9递等式计算

(2.6*1.9)÷(2.6*1.9)=1

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

2/3*6+2/3*9=4+6=10

3.9—4.1+6.1—5.9 =(6.1-4.1)+(3.9-5.9) =2-(5.9-3.9) =2-2 =0 方法2: 3.9-4.1+6.1-5.9 =(3.9+6.1)-(4.1+5.9) =10-10 =0

70.1-9.9 =70.1-(10-0.1) =70.1-10+0.1 =60.1+0.1 =60.2

(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....

2*(18.5-3.15)+6.6/(0.75-0.2) =2*15.35+6.6/0.55 =30.7+22 =52.7 0.15/2.1*56 =0.15/0.3*56/7 =0.5*8 =4 12.5/3.6-7/9+8.3/3.6 =(12.5-2.8+8.3)/3.6 =18/3.6 =5

4/3—(2/5+3/1O丿=4O/3O一{I2/30+9/3o)=4o/30_21/3o=丨9/30先通分再计算

1/3+7/9+5/6+17/18 =6/18+14/18+15/18+17/18 =52/18 =26/9 =2又8/9 6/11-(6/11-7/9) =6/11-6/11+7/9 =0+7/9 =7/9 15-5÷12-7/12 =15-5/12-7/12 =15-(5/12+7/12) =15-1 =14 120÷4-12-9 =30-12-9 =18-9 =9 答...

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