(x+70):6=7:2.1
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(x+70):6=7:2.1
(x+70):6=7:2.1
(x+70):6=7:2.1
这道题的正确答案是:
(X+70)*2.1=6*7
(x+70)*2.1=42
X+70=42/2.1
X+70=20
X=20-70
x=-50
0.3+0.3x=0.39 x= 2x-1.5x=7.6x x= 0.36x÷0.3=1.2 x=6(x+1.2)=18.6 x= 7x+2x = 8.1 x= (x-5)÷3=1.7 x=5(x+1.1)=15.5 x= 9x+25=70 x= 7x-4x=2.1 x=
x/x-2+x-9/x-7=x+1/x-1+x-8/x-6,
x/x-2+x-9/x-7=x+1/x-1+x-8/x-6,
1.(x*2-3x+3)/(x*2-3x+2)-(x*2-5x+7)/(x*2-5x+6)-1/(x*2-4x+3)2.1/x(x+1)+2/(x+1)(x+3)+3/(x+3)(x+6) 3.已知:x*2-3x+1=0,求x*2+1/x*2.
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
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
2x+3x+4x+5x+x+6x+7x=100
(x+7/x+6) +(x+9/x+8)=9x=(x+10/x+9) +(x+6/x+5)
x+2/x+1-x+4/x+3=x+6/x+5-x+8/x+7 x=?
x-4/x-5 - x-5/x-6=x-7/x-8 - x-8/x-9求x=?
已知3x*x-x=1,求6x*x*x+7x*x-5x+2000
(x+8)(x+6)(x+7)+(x+5)(x+6)(x+7)=(x+5)(x+8)(x+7)+(x+5)(x+8)(x+6)
(x+70):6=7:2.1
谁能帮我解下列一元二次方程啊(4x+3)(5-X)=02X^2-4X-5=03x(x-1)=2-2xx(x+6)=7(x-1)^2+2x(x-1)=0-3x^2-4x+4=0(X-1)(X+2)=70(3-X)^2+X^2
27046=2x( )+7x( )+4x( )+6x( )
47026=4x()+7x()+2x()+6x()
2706=2x( )+7x( )+4x( )+6x( )
(x+7)(x+6)-(x-2)(x+1)=?