Question

五分之四x减十等于七分之五x减七分之四十怎么算？

Answer 1

4／5x一10=5／7x一40／7
35×（4／5x一10）=35×（5／7x一40／7）
28x一350=25x一200
28x一25x=35o一200
3x=150
x=150÷3
x=50

Answer 2

4/5x-10=5/7x-40/7
(4/5-5/7)x=10-40/7
(28/35-25/35)x=30/7
(3/35)x=30/7
21x=1050
x=1050÷21
x=50

Answer 3

4/5x-10=5/7x-40/7
4∥5x一5／7x二l0一40／7
28／35x一25／35x二
10一40／7
3／35x二10一5又5／7
3／35x二5又5／7
3／35x二4o／7
x二4o／7x35／3
x二1400／21
x200／3

Answer 4

4/5x-10=5/7x-40/7
4/5x-5/7x=-40/7+10
（28/35-25/35）x=-40/7+70/7
3/35x=30/7
x=50

Answer 5

4/5X-10=5/7X-40/7
(4/5-5/7)X=10-40/7
X=35/3×(30/7)
=50

追答

答:X=50
4/5X-10=5/7X-40/7
(4/5-5/7)X=10-40/7
X=35/3×(30/7)
=50