www.qprq.net > 5.5X+4.5X=50怎么写.X%(7/2+4075)=5/12怎么写(4X...

5.5X+4.5X=50怎么写.X%(7/2+4075)=5/12怎么写(4X...

不知道你是几年级 前面的全是一元一次方程很简单的阿 化简之后求出X就可以了阿 第五题应该是一元二次吧 移项 化简得X得平方=5 x=根号5就可以了阿 自己算算很简单的阿

(4.5-x)*7=17.5 4.5-x=17.5/7 x=4.5-2.5 x=2 x/2+4=3/2x+1 x/2-3x/2=1-4 x=3 7/2*2/3-4x=7/3 7/3-4x=7/3 x=0 5/8(x-.3)=75% x-3=3/4*8/5 x=3+6/5 x=21/5 (1+x)/4=4:5 1+x=4*4/5 x=11/5

#include int main(){ double x; double fx; printf("请输入x的值:"); scanf("%lf",&x); if(x

4.5x+6.5x=4*8.2 11x=32.8 x=38.2/11 x=164/55

(1)40%X=120, 40%X÷40%=120÷40%, x=300;(2)X+4X=250, 5x=250, 5x÷5=250÷5, x=50;(3)X-150=50%X, X-150+150=50%X+150, x-50%x=50%x+150-50%x, 50%x=150, 50%x÷50%=150÷50%, x=300.

①4x+7.1=12.5, 4x+7.1-7.1=12.5-7.1, 4x÷4=5.4÷4, x=1.35;②4.5÷(x-0.51)=50,4.5÷(x-0.51)×(x-0.51)=50×(x-0.51), 50×(x-0.51)=4.5, 50×(x-0.51)÷50=4.5÷50, x-0.51+0.51=0.09+0.51, x=0.6;③x:14%=1 3 7 :0.8, 0.8x=14...

15X-2.5=11.5 15X=11.5+2.5 15X=14 X=14/15; 3(x+2)=39 X+2=39/3 X+2=13 X=13-2 X=11 x-(3/5)x=6/5 (5/5-3/5) x=6/5 (2/5)x=6/5 2x=6 x=6/2 x=3 4.9÷7/2-5x=0.8 0.7/2=5x+0.8 5x=0.7/2-0.8 5x=0.35-0.8 x=-0.45/5=-0.09 8/5÷x=16 8/5=16x x=(8/5...

2x+3=x-1=>x=-4 2x-1=-x+5=>3x=6=>x=2 3分之14x-12X3=14=>14x=150=>x=75/7 x-9分之4x=4.5÷7分之15=>5x/9=21/10=>x=6/7

( x-22.5):(5/4x+22.5)=5:7 7( x-22.5)=5(5/4x+22.5) 7x-157.5=6.25x+112.5 7x-6.25x=112.5+157.5 0.75x=270 x=270÷0.75 x=360

f(x)=[(x^2+2x+7)^2+(x^2+2x+7)+50]/(x^2+2x+7) =(x^2+2x+7)+50/(x^2+2x+7)+1 >=10√2+1 拐点 -1

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