计算(1)a7÷a4(2)(-m)8÷(-m)3(3)(xy)7÷(xy)4(4)x2m+2÷xm+2(5)(x-y)5÷(y-x)3(6)x6÷x2•x
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计算 (1)a7÷a4 (2)(-m)8÷(-m)3 (3)(xy)7÷(xy)4 (4)x2m+2÷xm+2 (5)(x-y)5÷(y-x)3 (6)x6÷x2•x |
答案
(1)a7÷a4=a3; (2)(-m)8÷(-m)3=(-m)5=-m5; (3)(xy)7÷(xy)4=(xy)3=x3y3; (4)x2m+2÷xm+2=xm; (5)(x-y)5÷(y-x)3=-(y-x)5÷(y-x)3=-(y-x)2; (6)x6÷x2•x=x4•x=x5. |
举一反三
下列运算中,正确的是( )A.2+=2 | B.(x+2y)2=x2+4y2 | C.x8÷x4=x2 | D.÷=x-2 |
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