| 1. 难度:简单 | |
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a2b+3ab2-a2b;
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| 2. 难度:简单 | |
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2(a-1)-(2a-3)+3;
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| 3. 难度:简单 | |
|
2(2a2+9b)+3(-5a2-4b);
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| 4. 难度:简单 | |
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3(x3+2x2-1)-(3x3+4x2-2);
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| 5. 难度:简单 | |
|
(2x2-
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| 6. 难度:简单 | |
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3(x2-x2y-2x2y2)-2(-x2+2x2y-3);
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| 7. 难度:简单 | |
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-(2x2+3xy-1)+(3x2-3xy+x-3);
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| 8. 难度:简单 | |
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(4ab-b2)-2(a2+2ab-b2);
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| 9. 难度:简单 | |
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-3(2x2-xy)+4(x2+xy-6);
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| 10. 难度:简单 | |
|
2a2-[-5ab+(ab-a2)]-2ab.
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