解方程23x-12x+56=4358:x=80%:4970% x+20% x=3.6 &...
解方程23x-12x+56=4358:x=80%:4970%x+20%x=3.64x-6=38....
解方程23x-12x+56=4358:x=80%:4970% x+20% x=3.6 4x-6=38.
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(1)
x-
x+
=
,
x+
=
,
x+
-
=
-
,
x=
,
x÷
=
÷
,
x=3;
(2)
:x=80%:
,
80%x=
×
,
80%x=
,
80%x÷80%=
÷80%,
x=
;
(3)70% x+20% x=3.6,
90%x=3.6,
90%x÷90%=3.6÷90%,
x=4;
(4)4x-6=38,
4x-6+6=38+6,
4x=44,
4x÷4=44÷4,
x=11.
2 |
3 |
1 |
2 |
5 |
6 |
4 |
3 |
1 |
6 |
5 |
6 |
4 |
3 |
1 |
6 |
5 |
6 |
5 |
6 |
4 |
3 |
5 |
6 |
1 |
6 |
1 |
2 |
1 |
6 |
1 |
6 |
1 |
2 |
1 |
6 |
x=3;
(2)
5 |
8 |
4 |
9 |
80%x=
5 |
8 |
4 |
9 |
80%x=
5 |
18 |
80%x÷80%=
5 |
18 |
x=
25 |
72 |
(3)70% x+20% x=3.6,
90%x=3.6,
90%x÷90%=3.6÷90%,
x=4;
(4)4x-6=38,
4x-6+6=38+6,
4x=44,
4x÷4=44÷4,
x=11.
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