4×(5.5x+x)=78
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4×(5.5x+x)=784×(5.5x+x)=784×(5.5x+x)=784×(5.5x+x)=785.5x+x=78÷46.5x=19.5x=19.5÷6.5x=34*6.5x=786.5x=1
4×(5.5x+x)=78
4×(5.5x+x)=78
4×(5.5x+x)=78
4×(5.5x+x)=78
5.5x+x=78÷4
6.5x=19.5
x=19.5÷6.5
x=3
4*6.5x=78
6.5x=19.5
x=3
4×(5.5x+x)=78
3x+4(x+5.5)=78,
3x+4(x+5.5)=78,
4.2-0.6x=3.6x 5x+2x=33.6 7x-4x=0.75 2x+7x+2.1=12 56x-32x-119=361 x+5=2x 3x+9=6x 4x-28=2x 2x+18=7x 5x=25*4-15x 7x-x+2*3=29.4 (28.8+5.5x+3.2)除2=71
X+X+2+X+4-(X+4)=26
(16x^4+4x^2+x)/x=?
(X+5)/(X+4) +(X+8)/(X+7 )=(X+7)/(X+6 )+(X+6)/(X+5 )
解方程:(x-8)/(x-3)-(x-9)/(x-4)=(x+7)/(x+8)-(x+2)/(x+3)
3/x-1=4/x 6/x+1=x+5/x(x+1)
(x+x)+(x-x)+(x/x)=11.2
8x+4=32.(X+3)/6=9X=?X=?
8x-5.5x=7.57.2x÷3.6=2 3x+6x-8x=0.7 12x-2x-5x=4.512x-x=0 5x+x=1.8 3.2x+1.8x=64.8x-0.8x=6 6.3-0.3x=9.6 8.6x-8.5x=0.720x-2x=36 9x+6x=4.5 18x-12x=5.42x-1.6x=3.6 18x+3x=7×6 1.2x-0.5x=0.71.3x+2.7x=1 4x-3.2x=6.4 0.8x+3.2x+3x=562.8x-2x=7.2
一元二次方程 (3.14×2x÷4)+x+(3.14x²÷x)+(3.14x²÷x-x)=15.7
已知x²+8x-13=0,求(x+2)(x-2)-4x(x-1)+(2x+1)²的值
12—120%X=6 5分之3X—5%X=5.5 (1+25%)X=7.5 X—30%X=91 4%X+6%X=29.4 X+25%X=8.75
先化简,再求值:[(x-2/x²+2x)-(x-1/x²+4x+4)]÷﹙x-4/x+2﹚,其中x²+2x-1=0.
先化简再求值先化简再求值:(x-x/x+1)(x+1/x^2+4x+4)(x^2-4/x^2-2x),其中x=-0.5
解方程6^x+4^x=9^x,9^(-x)-2*3^(1-x)=27