题目内容
解方程:
+x=
X-
+
=
x-(
+
)=
4x-
=
.
| 1 |
| 6 |
| 3 |
| 4 |
X-
| 1 |
| 3 |
| 1 |
| 6 |
| 5 |
| 6 |
x-(
| 1 |
| 6 |
| 5 |
| 12 |
| 7 |
| 24 |
4x-
| 3 |
| 8 |
| 5 |
| 8 |
分析:(1)根据等式的性质,两边同减去
计算即可;
(2)运用减法的性质,把原式变为X-(
-
)=
,即X-
=
,根据等式的性质,两边同加上
即可;
(3)先求出
+
=
,根据等式的性质,两边同加上
即可;
(4)根据等式的性质,两边同加上
,再同除以4即可.
| 1 |
| 6 |
(2)运用减法的性质,把原式变为X-(
| 1 |
| 3 |
| 1 |
| 6 |
| 5 |
| 6 |
| 1 |
| 6 |
| 5 |
| 6 |
| 1 |
| 6 |
(3)先求出
| 1 |
| 6 |
| 5 |
| 12 |
| 7 |
| 12 |
| 7 |
| 12 |
(4)根据等式的性质,两边同加上
| 3 |
| 8 |
解答:解:(1)
+x=
,
+x-
=
-
,
x=
;
(2)X-
+
=
,
X-(
-
)=
,
X-
=
,
X-
+
=
+
,
X=1;
(3)x-(
+
)=
,
x-
=
,
x-
+
=
+
,
x=
;
(4)4x-
=
,
4x-
+
=
+
,
4x=1,
4x÷4=1÷4,
x=
.
| 1 |
| 6 |
| 3 |
| 4 |
| 1 |
| 6 |
| 1 |
| 6 |
| 3 |
| 4 |
| 1 |
| 6 |
x=
| 7 |
| 12 |
(2)X-
| 1 |
| 3 |
| 1 |
| 6 |
| 5 |
| 6 |
X-(
| 1 |
| 3 |
| 1 |
| 6 |
| 5 |
| 6 |
X-
| 1 |
| 6 |
| 5 |
| 6 |
X-
| 1 |
| 6 |
| 1 |
| 6 |
| 5 |
| 6 |
| 1 |
| 6 |
X=1;
(3)x-(
| 1 |
| 6 |
| 5 |
| 12 |
| 7 |
| 24 |
x-
| 7 |
| 12 |
| 7 |
| 24 |
x-
| 7 |
| 12 |
| 7 |
| 12 |
| 7 |
| 24 |
| 7 |
| 12 |
x=
| 7 |
| 8 |
(4)4x-
| 3 |
| 8 |
| 5 |
| 8 |
4x-
| 3 |
| 8 |
| 3 |
| 8 |
| 5 |
| 8 |
| 3 |
| 8 |
4x=1,
4x÷4=1÷4,
x=
| 1 |
| 4 |
点评:此题考查了根据等式的性质解方程,即方程两边同加、同减、同乘或同除以某数(0除外),方程的左右两边仍相等;注意“=”号上下要对齐.
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