题目内容
计算和解方程
(1)
-(-
-
)÷(-2)
(2)(-
)×
÷(
)2
(3)4x-3(20-x)=-4
(4)
-
=1.
(1)
| 1 |
| 30 |
| 2 |
| 3 |
| 3 |
| 5 |
(2)(-
| 2 |
| 3 |
| 27 |
| 8 |
| 3 |
| 2 |
(3)4x-3(20-x)=-4
(4)
| x-7 |
| 4 |
| 5x+8 |
| 3 |
(1)
-(-
-
)÷(-2)
=
-(-
)×(-
)
=
-
=-
;
(2)(-
)×
÷(
)2
=(-
)×
×
=-1;
(3)去括号得,4x-60+3x=-4,
移项得,4x+3x=-4+60,
合并同类项得,7x=56,
系数化为1得,x=8;
(4)去分母得,3(x-7)-4(5x+8)=12,
去括号得,3x-21-20x-32=12,
移项得,3x-20x=12+21+32,
合并同类项得,-17x=65,
系数化为1得,x=-
.
| 1 |
| 30 |
| 2 |
| 3 |
| 3 |
| 5 |
=
| 1 |
| 30 |
| 19 |
| 15 |
| 1 |
| 2 |
=
| 1 |
| 30 |
| 19 |
| 30 |
=-
| 3 |
| 5 |
(2)(-
| 2 |
| 3 |
| 27 |
| 8 |
| 3 |
| 2 |
=(-
| 2 |
| 3 |
| 27 |
| 8 |
| 4 |
| 9 |
=-1;
(3)去括号得,4x-60+3x=-4,
移项得,4x+3x=-4+60,
合并同类项得,7x=56,
系数化为1得,x=8;
(4)去分母得,3(x-7)-4(5x+8)=12,
去括号得,3x-21-20x-32=12,
移项得,3x-20x=12+21+32,
合并同类项得,-17x=65,
系数化为1得,x=-
| 65 |
| 17 |
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