作业帮分式通分,
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分式通分,
分式通分,
分式通分,
做出来没有啊?还要帮忙吗?
呢吗cchhgfgf
1）1/（2x+3)=(2x-3)/(2x+3)(2x-3)
, 2/(3-2x)= -2/(2x-3)= -2(2x+3)/(2x+3)(2x-3),
(2x+5)/(4x²-9)=(2x+5)/(2x+3)(2x-3)
2) a-b=(a+b)(a-b)²/(a+b)(a-b)
b/(a...
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1）1/（2x+3)=(2x-3)/(2x+3)(2x-3)
, 2/(3-2x)= -2/(2x-3)= -2(2x+3)/(2x+3)(2x-3),
(2x+5)/(4x²-9)=(2x+5)/(2x+3)(2x-3)
2) a-b=(a+b)(a-b)²/(a+b)(a-b)
b/(a-b)=b(a+b)/(a+b)(a-b)
1 /(a²-b²)=1/(a+b)(a-b)
6) 1/(x+1)(x+2)=(x+3)/(x+1)(x+2)(x+3)
1/(x+2)(x+3)=(x+1)/(x+1)(x+2)(x+3)
1/(x+1)(x+3)=(x+2)/(x+1)(x+2)(x+3)
7) x/(x²-x)=1/(x-1)=(x+1)²/(x-1)(x+1)²
2/(x²-1)=2/(x+1)(x-1)=2(x+1)/(x-1)(x+1)²
1/(x²+2x+1)=1/(x+1)²=(x-1)/(x-1)(x+1)²
收起
a/c±b/c=(a+b)/c
同分母分式相加减,分母不变,把分子相加减
a/b±c/d=ad/bd±bc/bd=(ad±bc)/bd
异分母分式相加减,先通分(找最小公倍数),变为同分母的分式,再加减