(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=14 x2=11 (8)x^2-12x-108=0 答案：x1=-6 x2=18 (9)x^2+4x-25...

一元二次方程1、2、3、4、5、（x+5）2=166、2（2x－1）－x（1－2x）=07、x2=8、5x2-=09、8（3-x）2–72=010、3x(x+2)=5(x+2)11、（1－3y）2+2（3y－1）=012、x+2x+3=013、x+6x－5=014、x－4x+3=015、x－2x－1=016、2x+3x+1=017、3x+2x－1=018、5x－3x+...

1x*x+5x+6=182 2x*x+25x+7=182 3x*x+28x+8=776 6x*x+11x+6=853 4x*x+24x+2=1410 4x*x+12x+7=79 5x*x+1x+7=335 10x*x+23x+4=828 9x*x+3x+2=1124 8x*x+16x+8=2592 10x*x+14x+8=1616 6x*x+5x+8=658 4x*x+13x+0=165 9x*x+19x+7=1097 6x*...

(x-1/3)^2+2/9<0 无解 (3)-x^2+2x+1>=0 x^2-2x-1<=0 (x-1)^2-1-1<=0 (x-1)^2<=2 -√2<x-1<=√2 1-√2<=x<=1+√2 (5)2x^2-3x-4>=0 x^2-3x/2-2>=0 (x-3/4)^2-9/16-2>=0 (x-3/4)^2>=41/16 x-3/4>=√41/4，x>=(3+√41)/4...

2 44. 2(x-2)-3(4x-1)=9(1-x) 45. 11x+-2x=100-9x 46. (3x+8)/3=41 47. x/4+9x/4=0.25 48. 15x+8-7x=12 49. 48-(x-3)=2+x 50. 3x/6x+4x=9/2 实数计算题 1. 3/7 × 49/9 - 4/3 2. 8/9 × 15/36 + 1/27 3. 12× 5/6 – 2/9 ...

答案：x=50 y=59 (19) 54x+68y=3284 78x+y=1404 答案：x=18 y=34 (20) 70x+13y=3520 52x+y=2132 答案：x=41 y=50 (21) 48x-54y=-3186 24x+y=1080 答案：x=45 y=99 (22) 36x+77y=7619 47x-y=799 答案：x=17 y=91 (23) 13x-42y=-2717 31x-y=1333 答案：x...

1、x²-7x+12<0, (x-3)(x-4)<0, 3<x<4.2、2x²+3x+1>0 . (2x+1)(x+1)>0, x<-1或x>-1/2.3、-x²-7x+18<0. x²+7x-18>0, (x+9)(x-2)>0, x<-9或x>2.

X^2表示平方，给你50道 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 ...

(X+4)(X-1)<0 X-3/X+7<0 4X^-4X>15 14-4X^≥X X(X+2)<X(3-X)+1 -X^-2X+8≥0 (5-X)(X+4)<0 (X+7)(2-X)<0 (3X+2)(2X-1）<0 （1/2X-1)(5x+3)≥0 0<X^-X-2<4 2X^-3X+1<0 (2X+1)(4X-3)>0 -3X^+4X+4<0 0<4X^-11X-3<3 这些题希望...

1、2X+3＞0 -3X+5＞0 2、2X＜-1 X+2＞0 3、5X+6＜3X 8-7X＞4-5X 4、2（1+X）＞3（X-7）4（2X-3）＞5（X+2）5、2X＜4 X+3＞0