8-1 9+1 3),(5/8-1/4)÷(8/9+1/3)?

2020-12-03 21:34:36 字数 3723 阅读 8421

1楼:匿名用户

①( 5/8 - 1/4 ) ÷ ( 8/9 + 1/3 )= ( 5/8 - 2/8 ) ÷ ( 8/9 + 3/9 )= 3/8 ÷ 11/9

= 3/8 ×

9/11

= 27/88

② 3/8 + 3/4 × 2/3 ÷ 6= 3/8 + 12/12 ÷ 6

= 3/8 + 6/12

= 3/8 + 1/2

= 3/8 + 4/8

= 7/8

③ (1/4 + 1/5)×4×5

= (1/4 + 1/5)× 20

= 1/4 × 20 + 1/5 × 20= 5 + 4

= 9④ 3/5 +(1 - 7/10)÷ 3/20= 3/5 + 3/10 × 20/3

= 3/5 + 60/30

= 3/5 + 2

= 3/5 + 10/5

= 13/5

⑤ 4.5x + 0.2x = 6.1

4.7 x = 6.1

x = 6.1 / 4.7

x = 61/47

⑥ 3/4x - 1/3 = 5/6

(3/4) x = 5/6 + 2/6

(3/4) x = 7/6

x = 7/6 ÷ 3/4

x = 7/6 × 4/3

x = 28/18

x = 14/9

(5/8-1/4)÷(8/9+1/3)

2楼:匿名用户

(5/8-1/4)÷(8/9+1/3)=3/8÷11/9=27/883/8+3/4×2/3÷6=3/8+1/2÷6=3/8+1/12=11/24

(1/4+1/5)×4×5=9/20×4×5=93/5+(1-7/10)÷3/20=3/5+3/10×20/3=3/5+2=13/5

4.5x+0.2x=6.1

4.7x=6.1

x=61/47

3/4x-1/3=5/6

3/4x=5/6+1/3

3/4x=7/6

x=14/9

希望你能采纳,评为最佳答案,谢谢!

3楼:匿名用户

1.原式=(5/8-2/8)÷(8/9+3/9)=(3/8)÷(11/9)=27/88

2.原式=3/8+1/2x1/6=3/8+1/12=9/24+2/24=11/24

3.原式=(5/20+4/20)x20=(9/20)x20=94.原式=3/5+(3/10)÷(3/20)=3/5+2=13/55.

原方程变为4.7x=6.1,解得:

x=61/476.原方程变为(3/4)x=5/6-1/3,即(3/4)x=1/2,所以x=(1/2)x(4/3)=2/3

4楼:世纪风霜

(5/8-1/4)÷(8/9+1/3)

=(5/8-2/8)÷(8/9+3/9)

=3/8÷11/9

=3/8×9/11

=27/88

3/8+3/4×2/3÷6

=3/8+1/2÷6

=3/8+1/2×1/6

=3/8+1/12

=9/24+2/24

=11/24

(1/4+1/5)×4×5

=1/4+×4×5+1/5×4×5

=1×5+1×4

=5+4

=93/5+(1-7/10)÷3/20

=3/5+3/10÷3/20

=3/5+2

=3/5+10/5

=13/5

4.5x+0.2x=6.1(方程)

4.7x=6.1

x=47/61

3/4x-1/3=5/6(方程)

3/4x=5/6+1/3

3/4x=5/6+2/6

3/4x=7/6

x=7/6÷3/4

x=7/6×4/3

x=14/9

5楼:浅爱琉璃

(5/8-1/4)÷(8/9+1/3)

=(5/8-2/8)÷(8/9+3/9)

=(3/8)÷(11/9)

=3/8 *9/11

=27/88

(5/8-1/4)÷(7/9+1/3)

6楼:枫叶

(5/8-1/4)÷(7/9+1/3)

=3/8÷10/9

=80分之27

你好,本题已解答,如果满意

请点右下角“采纳答案”。

7楼:匿名用户

(5/8-1/4)÷(7/9+1/3)

=3/8÷4/9

=3/8×9/4

=27/32

(5/8-1/4)÷(8/9+1/3)

8楼:妙酒

(5/8-1/4)÷(8/9+1/3)

=3/8÷11/9

=27/88

5/8-1/4×(8/9÷2/3)

9楼:小辣

5/8-1/4×(8/9÷2/3)

=5/8-1/4×4/3

=5/8-1/3

=15/24-8/24

=7/24

10楼:匿名用户

5/8-1/4×(8/9÷2/3)

=5/8-1/4x4/3

=15/24-8/24

=7/24

5/8-1/4x(8/9÷2/3)

11楼:春花秋月季

=5/8-1/4(8/9×3/2)

=5/8-1/4×4/3

=5/8-1/3

=(15-8)/24

=7/24

(5/8+1/4)÷(2/3-1/2)括号的简便方法怎么做?

12楼:匿名用户

(5/8+1/4)÷(2/3-1/2)

=7/8÷1/6

=7/8×6

=21/4

=5又1/4

(3/8-1/4)÷(8/9×3/4)

13楼:匿名用户

(3/8-1/4)÷(8/9×3/4)

=5/8÷24/36

=5/8×3/2

=15/16

真希望能帮到你!满意请采纳!

1.75×6/7+3/14×7/4+7/4 (5/8-1/4)÷(8/9+1/3) 1/42+1/56+1/72+1/90+1/110+1/132

14楼:匿名用户

1.75×6/7+3/14×7/4+7/4=7/4x6/7+3/14x7/4+7/4= (6/7+3/14+1)x7/4

=(12/14+3/14+14/14)x7/4=29/14x7/4

=29/8

5/8-1/4)÷(8/9+1/3)

=(5/8-2/8)÷(8/9+3/9)

=3/8÷11/9

=3/8x9/11

=27/88

1/42+1/56+1/72+1/90+1/110+1/132=1÷(42+56+72+90+110+132)=1÷502

=1/502

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