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4/7×括号3/8%1/5括号加0.8用递等式计算

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5又七分之6-括号八分之3-7分之一括号用递等式计 =5+6/7-(3/8-1/7) =5+6/7-3/8+1/7 =5+1-3/8 =5又5/8

10+9+8+7+6+5+4+3+2+1 =(10+1)+(9+2)+(8+3)+(7+4)+(7+4)+(6+5) =11+11+11+11+11+11 =11×6 =66

5/7+1/9+8/9 =5/7+(1/9+8/9) =5/7+1 =12/7 11/4-7/11-4/11 =11/4-(7/11+4/11) =11/4-1 =7/4 3-5/8+5/8 =3+(5/8-5/8) =3 6-1/5-1/5 =6-(1/5+1/5) =6-2/5 =28/5

4/5-(3/8-1/5) =4/5-3/8+1/5 =4/5+1/5-3/8 =1-3/8 =5/8

(1)0.4×(3.2-0.8)÷1.2=0.4×2.4÷1.2=0.96÷1.2=0.8;(2)0.78÷0.26+0.5×0.22=3+0.11=3.11;(3)44.28÷0.9÷4.1=49.2÷4.1=12;(4)20.88÷0.8-12.9+1.1=26.1-12.9+1.1=13.2+1.1=14.3.

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

3/8+2/7-1/8+5/7 =(3/8-1/8)+(2/7+5/7) =1/4+1 =1又1/4 -----------------------------------------------------------------------------------------

0-0.1+0.2-0.3+0.4-0.5+0.6-0.7+0.8-0.9+1 =(0.2-0.1)+(0.4-0.3)+(0.6-0.5)+(0.8-0.7)+(1-0.9) =0.1X5 =0.5

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