因式分解 方程①10x²-21xy+2y²②5x-0.4/0.3+1.3-3x/2=1.8-8x/1.2③2|1-2||1-2x||+2x=1④已知a、b、c不为零,且a²+b²+c²=1,a(1/b+1/c)+b(1/a+1/c)+c(1/a+1/b)+3=0,求a+b+c.⑤方程|x|=1+ax有一负根无正根
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