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

问题描述:

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