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【求10道初二数学分式混合运算题】
求10道初二数学分式混合运算题
1回答
2019-07-03 02:29
【求10道初二数学分式混合运算题】
求10道初二数学分式混合运算题
2a+1-a+3a2-4a-5÷a2-9a2-3a-10.
解原式=[x+2x(x-2)-x-1(x-2)2]•x4-x(括号内分式的分母中的多项式式分解因式.分式的除法法则)
=[(x+2)(x-2)x(x-2)2-x(x-1)x(x-2)2]•x4-x(异分母的分式减法的法则)
=x2-4-x2+xx(x-2)2•x4-x(整式运算)
=x-4x(x-2)2•x4-x(合并同类项)
=x-4x(x-2)2•(-xx-4)(分式的符号法则)
=-1(x-2)2.(分式的乘法法则)
计算x+yx2-xy+(x2-y2x)2•(1y-x)3.
解原式=x+yx(x-y)+(x+y)2(x-y)2x2•1(y-x)3
=x+yx(x-y)-(x+y)2x2(x-y)
=x2+xy-x2-2xy-y2x2(x-y)
=-xy-y2x2(x-y)=-xy+y2x2(x-y).
x-y+4xyx-y)(x+y-4xyx+y)
答案x2-y2
[1(a+b)2-1(a-b)2]÷(1a+b-1a-b)
答案2a(a+b)(a-b);
xx-y•y2x+y-x4yx4-y4÷x2x2+y2
答案-xyx+y
3x-2x2-x-2+(1-1x+1)÷(1+1x-1)
答案x2(x+1)(x-2);
(2xx+1+2x-1+4xx2-1)×(2xx+1+2x-1-4xx2-1).
答案4
不许copy