题目内容
| 75-x=12 | x+1.5=5.1 | 5.5x-1.3x=12 | 3:0.5=x:9 |
(1)75-x=12,
75-x+x=12+x,
12+x=75-12,
x=63;
(2)x+1.5=5.1,
x+1.5-1.5=5.1-1.5,
x=3.6;
(3)5.5x-1.3x=12,
4.2x=12,
4.2x÷4.2=12÷4.2,
x=
;
(4)3:0.5=x:9,
0.5x=3×9,
0.5x÷0.5=27÷0.5,
x=54.
75-x+x=12+x,
12+x=75-12,
x=63;
(2)x+1.5=5.1,
x+1.5-1.5=5.1-1.5,
x=3.6;
(3)5.5x-1.3x=12,
4.2x=12,
4.2x÷4.2=12÷4.2,
x=
| 20 |
| 7 |
(4)3:0.5=x:9,
0.5x=3×9,
0.5x÷0.5=27÷0.5,
x=54.
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