题目内容
解方程.
6x+3.6=12 | 8x+25=57 | 0.8+3.6x=1.52 | ||||||||||
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分析:(1)根据等式性质,两边同减去3.6,再同除以6即可;
(2)根据等式性质,两边同减去25,再同除以8即可;
(3)根据等式性质,两边同减去0.8,再同除以3.6即可;
(4)根据等式性质,两边同除以
即可;
(5)根据等式性质,两边同除以
即可;
(6)根据等式性质,两边同乘上14,再同除以
即可.
(2)根据等式性质,两边同减去25,再同除以8即可;
(3)根据等式性质,两边同减去0.8,再同除以3.6即可;
(4)根据等式性质,两边同除以
3 |
4 |
(5)根据等式性质,两边同除以
3 |
5 |
(6)根据等式性质,两边同乘上14,再同除以
7 |
4 |
解答:解:(1)6x+3.6=12,
6x+3.6-3.6=12-3.6,
6x=8.4,
6x÷6=8.4÷6,
x=1.4;
(2)8x+25=57,
8x+25-25=57-25,
8x=32,
8x÷8=32÷8,
x=4;
(3)0.8+3.6x=1.52,
0.8-0.8+3.6x=1.52-0.8,
3.6x=0.72,
3.6x÷3.6=0.72÷3.6,
x=0.2;
(4)
x=18,
x÷
=18÷
,
x=18×
,
x=24;
(5)
x=
,
x÷
=
÷
,
x=
×
,
x=
;
(6)
x÷14=
,
x÷14×14=
×14,
x=7,
x÷
=7÷
,
x=7×
,
x=4.
6x+3.6-3.6=12-3.6,
6x=8.4,
6x÷6=8.4÷6,
x=1.4;
(2)8x+25=57,
8x+25-25=57-25,
8x=32,
8x÷8=32÷8,
x=4;
(3)0.8+3.6x=1.52,
0.8-0.8+3.6x=1.52-0.8,
3.6x=0.72,
3.6x÷3.6=0.72÷3.6,
x=0.2;
(4)
3 |
4 |
3 |
4 |
3 |
4 |
3 |
4 |
x=18×
4 |
3 |
x=24;
(5)
3 |
5 |
6 |
7 |
3 |
5 |
3 |
5 |
6 |
7 |
3 |
5 |
x=
6 |
7 |
5 |
3 |
x=
10 |
7 |
(6)
7 |
4 |
1 |
2 |
7 |
4 |
1 |
2 |
7 |
4 |
7 |
4 |
7 |
4 |
7 |
4 |
x=7×
4 |
7 |
x=4.
点评:此题考查了学生根据等式的性质解方程的能力.
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