问题
解答题
合并同类项: (1)3x2-[1+2x-(5+3x-x2)] (2)
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答案
(1)原式=3x2-1-2x+(5+3x-x2)
=3x2-1-2x+5+3x-x2
=2x2+x+4;
(2)原式=
a2-2 3
ab+1 2
a2+ab-b23 4
=
a2+17 12
ab-b2.1 2
合并同类项: (1)3x2-[1+2x-(5+3x-x2)] (2)
|
(1)原式=3x2-1-2x+(5+3x-x2)
=3x2-1-2x+5+3x-x2
=2x2+x+4;
(2)原式=
a2-2 3
ab+1 2
a2+ab-b23 4
=
a2+17 12
ab-b2.1 2