1.合并同类项 3分之2a的²—2分之一ab+4分之3a的²+ab—b的² 2.6x²y+2xy—3x²y²—7x—5yx—4g²—6x²y
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![1.合并同类项 3分之2a的²—2分之一ab+4分之3a的²+ab—b的² 2.6x²y+2xy—3x²y²—7x—5yx—4g²—6x²y](/uploads/image/z/1604509-61-9.jpg?t=1.%E5%90%88%E5%B9%B6%E5%90%8C%E7%B1%BB%E9%A1%B9++++3%E5%88%86%E4%B9%8B2a%E7%9A%84%26%23178%3B%E2%80%942%E5%88%86%E4%B9%8B%E4%B8%80ab%2B4%E5%88%86%E4%B9%8B3a%E7%9A%84%26%23178%3B%2Bab%E2%80%94b%E7%9A%84%26%23178%3B++++++2.6x%26%23178%3By%2B2xy%E2%80%943x%26%23178%3By%26%23178%3B%E2%80%947x%E2%80%945yx%E2%80%944g%26%23178%3B%E2%80%946x%26%23178%3By)
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1.合并同类项 3分之2a的²—2分之一ab+4分之3a的²+ab—b的² 2.6x²y+2xy—3x²y²—7x—5yx—4g²—6x²y
1.合并同类项 3分之2a的²—2分之一ab+4分之3a的²+ab—b的² 2.6x²y+2xy—3x²y²—7x—5yx—4g²—6x²y
1.合并同类项 3分之2a的²—2分之一ab+4分之3a的²+ab—b的² 2.6x²y+2xy—3x²y²—7x—5yx—4g²—6x²y
1.原式=(2/3+3/4)a^2+(-1/2+1)ab-b^2=17/12a^2+1/2ab-b^2
2.原式=(6-6)x^2y+(2-5)xy-3x^2y^2-7x-4g^2=-3xy-3x^2y^2-7x-4g^2