數學。計算過程。簡便方法

2021-03-10 19:35:49 字數 1473 閱讀 1515

1樓:兗礦興隆礦

1、5÷(5/6+5/9)

=5/[5(1/6+1/9)

=1/(15/54)

=54/15

=3.6

2、1.8×1/7-0.4÷專7

=1/7(1.8-0.4)

=1.4/7

=0.2

3、1/3×(0.75+

屬0.25÷2/3)

=0.75/3*(1+1/2)

=0.75/2

=3/8

4、2×3×4×(1/2+1/3+1/4)=3*4+8+6

=265、2010×2/15+2010÷15×3=2010*1/5

=402

6、5/8÷1/12×4/5÷1/6

=5/8*12*4/5*6

=12*4*6/8

=187、5/4÷2/3-2/3×3/5

=5/4*3/2-2/3*3/5

=15/8-2/5

=59/40

8、3/5÷2/3-2/3×3/5

=9/10-6/15

=15/30

=1/2

9、5/8÷[5/6-(1/6+1/4)]=5/8*12/5

=1.5

2樓:匿名使用者

1、5÷(5/6+5/9)

= 5÷du5(1/6+1/9)

=1÷[(3+2)/18]

18/5

2、zhi1.8×dao1/7-0.4÷7= 9/5×1/7-2/5/7

= (9-2)/(5*7)

= 1/5

3、1/3×(0.75+0.25÷2/3)= 1/3×(3/4+1/4÷2/3)

= 1/3×(3/4+3/8)

= 1/4+1/8

= 3/8

4、2×3×4×(1/2+1/3+1/4)= 3×4 +2×4 + 2×3

= 12 + 8 + 6

= 26

5、2010×2/15+2010÷15×3= 2010×(2+3)/15

= 2010/3

= 670

6、5/8÷1/12×4/5÷1/6

= 5/8×12×4/5×6

= 36

7、5/4÷2/3-2/3×3/5

= 5/4×3/2-2/3×3/5

= 15/8-2/5

= (15×5-2×8)/40

= 59/40

8、3/5÷2/3-2/3×3/5

= 3/5×3/2-2/3×3/5

= 9/10 - 2/5

= (9-2×2)/10

= 1/2

9、5/8÷[5/6-(1/6+1/4)]= 5/8÷[5/6-(2+3)/12]

= 1/8÷(1/6-1/12)

= 1/8÷(1/12)

= 1/8*12

= 3/2

希望能幫助到你

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