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歡迎您訪(fǎng)問(wèn)數(shù)學(xué)考題練習(xí):方程5x2=6x-8化成一般形式后,其各項(xiàng)系數(shù)!

數(shù)學(xué)考題練習(xí):方程5x2=6x-8化成一般形式后,其各項(xiàng)系數(shù)

更新時(shí)間:2024-01-12 16:35:53作者:貝語(yǔ)網(wǎng)校

方程5x2=6x-8化成一般形式后,其各項(xiàng)系數(shù)分別是

A.5,6,-8

B.5,-6,-8

C.5,-6,8

D.6,5,-8

試題答案

C

試題解析

一元二次方程的一般形式是:ax2+bx+c=0(a,b,c是常數(shù)且a≠0)特別要注意a≠0的條件.這是在做題過(guò)程中容易忽視的知識(shí)點(diǎn).在一般形式中ax2叫二次項(xiàng),bx叫一次項(xiàng),c是常數(shù)項(xiàng).其中a,b,c分別叫二次項(xiàng)系數(shù),一次項(xiàng)系數(shù),常數(shù)項(xiàng).

解答:5x2=6x-8,

移項(xiàng)得:5x2-6x+8=0,

∴它的二次項(xiàng)系數(shù)是5,一次項(xiàng)系數(shù)是-6,常數(shù)項(xiàng)是8.

故選C.

點(diǎn)評(píng):此題主要考查了一元二次方程的一般形式,要確定一次項(xiàng)系數(shù)和常數(shù)項(xiàng),首先要把方程化成一般形式.

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