解方程27x=821 23x÷14=12 23x+16x=15 34x:25=1516:89
2个回答
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(1)
x=
x÷
=
÷
x=1
;
(2)
x÷
=12
x÷
×
=12×
x÷
=3÷
x=4.5;
(3)
x+
x=15
x=15
x÷
=15÷
x=18;
(4)
x:
=
:
x×
=
×
2 |
7 |
8 |
21 |
2 |
7 |
2 |
7 |
8 |
21 |
2 |
7 |
x=1
1 |
3 |
(2)
2 |
3 |
1 |
4 |
2 |
3 |
1 |
4 |
1 |
4 |
1 |
4 |
2 |
3 |
2 |
3 |
2 |
3 |
x=4.5;
(3)
2 |
3 |
1 |
6 |
5 |
6 |
5 |
6 |
5 |
6 |
5 |
6 |
x=18;
(4)
3 |
4 |
2 |
5 |
15 |
16 |
8 |
9 |
3 |
4 |
8 |
9 |
2 |
5 |