解方程.7x+0.7×8=20.6 &
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解方程.
7x+0.7×8=20.6
x-(
7x+0.7×8=20.6
x-(
5 |
21 |
![解方程.7x+0.7×8=20.6 &](/uploads/image/z/13442709-21-9.jpg?t=%E8%A7%A3%E6%96%B9%E7%A8%8B%EF%BC%8E7x%2B0.7%C3%978%3D20.6%26nbsp%3B%26nbsp%3B%26nbsp%3B%26nbsp%3B%26nbsp%3B%26nbsp%3B%26nbsp%3B%26)
(1)7x+0.7×8=20.6
7x+5.6-5.6=20.6-5.6
7x÷7=15÷7
x=2
1
7;
(2)x-(
5
21+
3
7)=
2
3
x-
2
3=
2
3
x-
2
3+
2
3=
2
3+
2
3
x=1
1
3.
7x+5.6-5.6=20.6-5.6
7x÷7=15÷7
x=2
1
7;
(2)x-(
5
21+
3
7)=
2
3
x-
2
3=
2
3
x-
2
3+
2
3=
2
3+
2
3
x=1
1
3.