解方程.20-1.2x=5.6 &nb
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解方程.
20-1.2x=5.6
x:x=
:
20-1.2x=5.6
1 |
2 |
3 |
5 |
6 |
7 |
(1)20-1.2x=5.6,
20-1.2x+1.2x=5.6+1.2x,
5.6+1.2x=20,
5.6+1.2x-5.6=20-5.6,
12x=14.4,
12x÷12=14.4÷12,
x=1.2;
(2)
1
2:x=
3
5:
6
7,
3
5x=
1
2×
6
7,
3
5x=
3
7,
3
5x×
5
3=
3
7×
5
3,
x=
5
7.
20-1.2x+1.2x=5.6+1.2x,
5.6+1.2x=20,
5.6+1.2x-5.6=20-5.6,
12x=14.4,
12x÷12=14.4÷12,
x=1.2;
(2)
1
2:x=
3
5:
6
7,
3
5x=
1
2×
6
7,
3
5x=
3
7,
3
5x×
5
3=
3
7×
5
3,
x=
5
7.