题目内容
合并相同字母的项.
(1)3a+2a-7a;
(2)x-y+5x-4y;
(3)3y+
y-
y;
(4)
x+
x-
x.
(1)3a+2a-7a;
(2)x-y+5x-4y;
(3)3y+
1 |
2 |
1 |
4 |
(4)
2 |
3 |
5 |
6 |
1 |
2 |
(1)原式=-2a;
(2)原式=x+5x-(y+4y)=6x-5y;
(3)原式=(3+
-
)y=
y;
(4)原式=(
+
-
)x=x.
(2)原式=x+5x-(y+4y)=6x-5y;
(3)原式=(3+
1 |
2 |
1 |
4 |
13 |
4 |
(4)原式=(
2 |
3 |
5 |
6 |
1 |
2 |
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