题目内容
化简
(1)4x-2y-6y2-y-3x+5y2;
(2)(x3-2y3-3x2y)-(x3-3y3-4x2y);
(3)2a2-[5a-(
a+2)+2a2].
(1)4x-2y-6y2-y-3x+5y2;
(2)(x3-2y3-3x2y)-(x3-3y3-4x2y);
(3)2a2-[5a-(
1 |
2 |
(1)原式=4x-3x-2y-y-6y2+5y2
=x-3y-y2;
(2)原式=x3-2y3-3x2y-x3+3y3+4x2y
=y3+x2y;
(3)原式=2a2-(5a-
a-2+2a2)
=2a2-5a+
a+2-2a2
=-
a+2
=x-3y-y2;
(2)原式=x3-2y3-3x2y-x3+3y3+4x2y
=y3+x2y;
(3)原式=2a2-(5a-
1 |
2 |
=2a2-5a+
1 |
2 |
=-
9 |
2 |
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