預(yù)約課程還可獲贈免費(fèi)的學(xué)習(xí)復(fù)習(xí)診斷
點(diǎn)擊預(yù)約→免費(fèi)的1對1學(xué)科診斷及課程規(guī)劃
(1)(a-b)/(-a²)=-3(a-b)/3a²,(a+b)/(3a)=,a(a+b)/(3a²) (2) 5/-4ab²,4/5a²b 解:5/-4ab²=-25a/20a²b²,4/5a²b=16b/20a²b² (3)x/a(x-y),y/b(y-x) 解:x/a(x-y)=bx/ab(x-y),y/b(y-x)=-ay/ab(x-y) (4)a/(y-x)²,b/(x-y)(x+y) 解:a/(y-x)²=a/(x-y)²=a(x+y)/(x-y)²(x+y) b/(x-y)(x+y) =b(x-y)/(x-y)²(x+y) 4.①3-2b,2a/b-a 解:3-2b=(3-2b)(b-a)/(b-a) 2a/(b-a) ②1/a+1,3/1-a,5/a²-1 解:較簡公分母為(a+1)(a-1) 1/(a+1)=(a-1)/(a+1(a-1) 3/(1-a)=-3/(a-1)=-3(a+1)/(a+1)(a-1),5/a²-1=5/(a+1)(a-1) ③a/(a-b),b/(a²-b²),c/(a+b); 解:較簡公分母為(a+b)(a-b) a/(a-b)=a(a+b)/(a+b)(a-b) b/(a²-b²)=b/(a+b)(a-b) c/(a+b)=c(a-b)/(a+b)(a-b); ④a/a²-4,a-1/a-2,a+2/a²-4a+4 解:較簡公分母為(a+2)(a-2)² a/(a²-4)=a(a-2)/(a+2)(a-2)² (a-1)/(a-2)=(a-1)(a+2)(a-2)/(a+2)(a-2)² (a+2)/(a²-4a+4)=(a+2)²/(a+2)(a-2)²
點(diǎn)擊預(yù)約→99元快課,一次課聽懂一個知識點(diǎn)
預(yù)約課程還可獲贈免費(fèi)的學(xué)習(xí)復(fù)習(xí)診斷