题目内容
计算题.
|
|
| ||||||||||||||||||||||
1-
|
| x-
| ||||||||||||||||||||||
2x÷
| 4x÷
|
|
考点:分数的四则混合运算,分数的简便计算,方程的解和解方程
专题:运算顺序及法则,运算定律及简算,简易方程
分析:(1)把除以
化成乘以
,再运用乘法的分配律进行简算;
(2)把除以
化成乘以
,再运用乘法的交换律、结合律进行简算;
(3)运用除法的性质进行简算;
(4)根据等式的性质,方程两边同时加上
x,再两边同时减去
,最后再两边同时除以
求解;
(5)根据等式的性质,方程两边同时乘以
,再两边同时除以
求解;
(6)先化简方程,再根据等式的性质,方程两边同时除以
求解;
(7)根据等式的性质,方程两边同时乘以
,再两边同时除以2求解;
(8)根据等式的性质,方程两边同时乘以
,再两边同时除以4求解;
(9)根据等式的性质,方程两边同时乘以
,再两边同时除以
求解.
| 11 |
| 5 |
| 5 |
| 11 |
(2)把除以
| 9 |
| 13 |
| 13 |
| 9 |
(3)运用除法的性质进行简算;
(4)根据等式的性质,方程两边同时加上
| 3 |
| 4 |
| 3 |
| 5 |
| 3 |
| 4 |
(5)根据等式的性质,方程两边同时乘以
| 1 |
| 4 |
| 2 |
| 3 |
(6)先化简方程,再根据等式的性质,方程两边同时除以
| 3 |
| 4 |
(7)根据等式的性质,方程两边同时乘以
| 2 |
| 5 |
(8)根据等式的性质,方程两边同时乘以
| 2 |
| 3 |
(9)根据等式的性质,方程两边同时乘以
| 1 |
| 4 |
| 2 |
| 3 |
解答:
解:(1)
÷
+
×
=
×
+
×
=(
+
)×
=1×
=
;
(2)
×
÷
×
=
×
×
×
=(
×
)×(
×
)
=1×
=
;
(3)
÷(
×
)
=
÷
÷
=
×
×
=
=
;
(4)1-
x=
1-
x+
x=
+
x
1=
x+
1-
=
x+
-
=
x
÷
=
x÷
x=
;
(5)
x÷
=12
x÷
×
=12×
x=3
x÷
=3÷
x=
;
(6)x-
x=
x=
x÷
=
÷
x=
;
(7)2x÷
=
2x÷
×
=
×
2x=
2x÷2=
÷2
x=
;
(8)4x÷
=2
4x÷
×
=2×
4x=
4x÷4=
÷4
x=
;
(9)
x÷
=12
x÷
×
=12×
x=3
x÷
=3÷
x=
.
| 7 |
| 9 |
| 11 |
| 5 |
| 2 |
| 9 |
| 5 |
| 11 |
=
| 7 |
| 9 |
| 5 |
| 11 |
| 2 |
| 9 |
| 5 |
| 11 |
=(
| 7 |
| 9 |
| 2 |
| 9 |
| 5 |
| 11 |
=1×
| 11 |
| 5 |
=
| 5 |
| 11 |
(2)
| 9 |
| 13 |
| 5 |
| 6 |
| 9 |
| 13 |
| 5 |
| 6 |
=
| 9 |
| 13 |
| 5 |
| 6 |
| 13 |
| 9 |
| 5 |
| 6 |
=(
| 9 |
| 13 |
| 13 |
| 9 |
| 5 |
| 6 |
| 5 |
| 6 |
=1×
| 25 |
| 36 |
=
| 25 |
| 36 |
(3)
| 10 |
| 13 |
| 35 |
| 26 |
| 7 |
| 3 |
=
| 10 |
| 13 |
| 35 |
| 26 |
| 7 |
| 3 |
=
| 10 |
| 13 |
| 26 |
| 35 |
| 3 |
| 7 |
=
| 10×26×3 |
| 13×35×7 |
=
| 12 |
| 49 |
(4)1-
| 3 |
| 4 |
| 3 |
| 5 |
1-
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 5 |
| 3 |
| 4 |
1=
| 3 |
| 4 |
| 3 |
| 5 |
1-
| 3 |
| 5 |
| 3 |
| 4 |
| 3 |
| 5 |
| 3 |
| 5 |
| 2 |
| 5 |
| 3 |
| 4 |
| 2 |
| 5 |
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 4 |
x=
| 8 |
| 15 |
(5)
| 2 |
| 3 |
| 1 |
| 4 |
| 2 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
x=
| 9 |
| 2 |
(6)x-
| 1 |
| 4 |
| 3 |
| 8 |
| 3 |
| 4 |
| 3 |
| 8 |
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 8 |
| 3 |
| 4 |
x=
| 1 |
| 2 |
(7)2x÷
| 2 |
| 5 |
| 3 |
| 2 |
2x÷
| 2 |
| 5 |
| 2 |
| 5 |
| 3 |
| 2 |
| 2 |
| 5 |
2x=
| 3 |
| 5 |
2x÷2=
| 3 |
| 5 |
x=
| 3 |
| 10 |
(8)4x÷
| 2 |
| 3 |
4x÷
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
4x=
| 4 |
| 3 |
4x÷4=
| 4 |
| 3 |
x=
| 1 |
| 3 |
(9)
| 2 |
| 3 |
| 1 |
| 4 |
| 2 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
x=
| 9 |
| 2 |
点评:此题考查了四则混合运算的顺序及运算定律,以及根据等式性质解方程的能力.
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