问题标题:
【计算:①(6xy+5x)÷x②(8xy-6x2y)÷2xy③(15x2y-10xy2)÷5xy④(8a2-4ab)÷(-4a)⑤(25x3+15x2-20x)÷(-5x)⑥(12x3-8x2+16x)÷(-4x)⑦[(x+y)(x-y)-(x-y)2]÷2y⑧[(a+b)2-b(2a+b】
问题描述:
计算:
①(6xy+5x)÷x
②(8xy-6x2y)÷2xy
③(15x2y-10xy2)÷5xy
④(8a2-4ab)÷(-4a)
⑤(25x3+15x2-20x)÷(-5x)
⑥(12x3-8x2+16x)÷(-4x)
⑦[(x+y)(x-y)-(x-y)2]÷2y
⑧[(a+b)2-b(2a+b)-8a]÷2a.
刘成武回答:
①(6xy+5x)÷x=6y+5;②(8xy-6x2y)÷2xy=4-3x;③(15x2y-10xy2)÷5xy=3x-2y;④(8a2-4ab)÷(-4a)=-2a+b;⑤(25x3+15x2-20x)÷(-5x)=-5x2-3x+4;⑥(12x3-8x2+16x)÷(-4x)=-3x2+2x-4;⑦[(x+y)(x...
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