
求未知数X23x+12x=427.5x=2.5
1个回答
展开全部
(1)
x+
x=42
x=42
x÷
=42÷
x=36
(2)
=
2.5x=7.5×1.2
2.5x÷2.5=9÷2.5
x=3.6
(3)3.2x-4×6=40
3.2x-24+24=40+24
3.2x=64
3.2x÷3.2=64÷3.2
x=20
2 |
3 |
1 |
2 |
7 |
6 |
7 |
6 |
7 |
6 |
7 |
6 |
x=36
(2)
7.5 |
x |
2.5 |
1.2 |
2.5x=7.5×1.2
2.5x÷2.5=9÷2.5
x=3.6
(3)3.2x-4×6=40
3.2x-24+24=40+24
3.2x=64
3.2x÷3.2=64÷3.2
x=20
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