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一元二次方程100道例题

(1)x^2-9x+8=0 答案:x1=8 x2=1 (2)x^2+6x-27=0 答案:x1=3 x2=-9 (3)x^2-2x-80=0 答案:x1=-8 x2=10 (4)x^2+10x-200=0 答案:x1=-20 x2=10 (5)x^2-20x+96=0 答案:x1=12 x2=8 (6)x^2+23x+76=0 答案:x1=-19 x2=-4 (7)x^2-25x+154=0 答案:x1=

一元二次方程的解法一、知识要点:一元二次方程和一元一次方程都是整式方程,它是初中数学的一个重点内容,也是今后学习数学的基础,应引起同学们的重视.一元二次方程的一般形式为:ax2+bx+c=0, (a≠0),它是只含一个未

3X+5X=48 X=614X-8X=12 X=2 6*5+2X=44 X=720X-50=50 X=5 28+6X=88 X=1032-22X=10 X=1 4y+2=6 Y=1 x+32=76 X=443x+6=18 X=416+8x=40 X=32x-8=8 X=84x-3*9=29 X=98x-3x=105 X=21 x-6*5=42 X=72 x+5=7 X=22x+3=10 X=7/212x-9

2(x-2)-3(4x-1)=9(1-x) 11x+64-2x=100-9x 15-(8-5x)=7x+(4-3x) 3(x-7)-2[9-4(2-x)]=22 3/2[2/3(1/4x-1)-2]-x=2 2(x-2)+2=x+1 5x^2+3x+1=0 7x^2+x+12=0 2x^2+4x+4=0 8x^2+3x+1=0 5x^2+3x+2=0 45x^2+3x+100=0 89x^2+335x+1=0 x+1=3 2x+3=5 3x+5=8

x^2-2x-80=0 答案:x1=-8 x2=10 (x+8)(x-10) (4)x^2+10x-200=0 答案:x1=-20 x2=10 (x+20)(x-10) (5)x^2-20x+96=0 答案:x1=12 x2=8 (x-12)(x+8) (6)x^2+23x+76=0 答案:x1=-19 x2=-4 (x+19)(x+4) (7)x^2-25x+154=0 答案:x1=14 x2=11 (x-14)(x+1)

1) 66x+17y=3967 25x+y=1200 答案:x=48 y=47 (2) 18x+23y=2303 74x-y=1998 答案:x=27 y=79 (3) 44x+90y=7796 44x+y=3476 答案:x=79 y=48 (4) 76x-66y=4082 30x-y=2940 答案:x=98 y=51 (5) 67x+54y=8546 71x-y=56

X^2-X-6=0 2X^2-3X-2=0 -3X^2+6X=2 4X^2-4X+1=0 X^2-2X+3=0 -X^2-2X+8=0 X^2-X-2=4 2X^2-3X+1=0 -3X^2+4X+4=0 4X^2-11X-3=3 x^2-2x-3=04x^2-1=05x^2-3x+2=0-x^2-2x+8=0-2x2+x+3=0 2x^2+3x-9=0 x^2-9=04x^2-10x-6=05x^2-8x-4=03x^2

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