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6.5x7.8+3.5x2.2十3x2.2简便计算

4.1x+221.4=4.25x+216 0.15x=5.4 x=3.6 ②43-2(5+3)=3+6(x-1) 27=6x-3 x=5

3X+5X=48 14X-8X=12 6*5+2X=44 20X-50=50 28+6X=88 32-22X=10 24-3X=3 10X*(5+1)=60 99X=100-X X+3=18 X-6=12 56-2X=20 4y+2=6 x+32=76 3x+6=18 16+8x=40 2x-8=8 4x-3*9=29 8x-3x=105 x-6*5=42 x+5=7 2x+3=10 12x-9x=9 6x+18=48 56x-50x=30 5x...

see

解: 3(3x-2)=10-0.5(x+3.5) 9x-6=10- 1/2 *x-7/4 9x+1/2 x=10+6-7/4 19/2 x=14又1/4 x=57/4 * 2/19 x=3/2

=3.75×(5.3+3.5)÷2.2 =3.75×(8.8÷2.2) =3.75×4 =15 9.6/4.8x(7.2+2.8) =9.6/4.8x10 =9.6/48 =0.2

3x+0.4+6.8x+2/37+8x+3.14=18.936 (3+6.8+8)x+0.4+3.14+2/37=18.936 17.8x=18.936-0.4-3.14-2/37 17.8x=15.3419 x=0.8619

1、5.2-3.4X=0.72 -3.4X=0.72-5.2 -3.4X=-4.48 X=1.3176471

根据韦达定理 x1 + x2 = -3/k x1 * x2 = -6/k x1² + x2² = 5 (x1 + x2)² - 2x1 * x2 = 5 9/k² + 12/k = 5 5k² - 12k + 9 = 0 (k - 3)(5k + 3) = 0 k = 3 或 k = -3/5 又因为二次函数的图像与x轴有两个交点 所以 △ > 0 ...

解方程see

2x-5/3+2>x X>-1/3 x-7/2+1-3/7 X>-3/14 2x-1/3-1/3+4/6 x>1/3 2-3x>3x-1+x/2 6x+X/2

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