x的平方减3x加2大于0怎么解 3x减7x加1≤4(1/3x减1/2)怎么算
3x减7x加1≤4(1/3x减1/2)怎么算
3x减7x加1≤4(1/3x减1/2)怎么算
3x-7x+1≤4((1/3)x-1/2)
-4x+1≤4((1/3)x-1/2)
6(-4x+1) ≤4(2x-3)
3(-4x+1) ≤2(2x-3)
16x≥9
x≥9/16
1/3x加50÷50等于x减1/3x减50÷40方程怎么算
X/3+50/50=x-1/3x-50/40
x/3+1=x-1/3x-1.25
x/3-x+1/3x=-1-1.25
-2x/3+1/3x=-2.25
-2x^2+1=-2.25*3x
-2x^2+6.75x+1=0
2X^2-6.75x-1=0
然后带入公式即可解出答案
解方程:负2(X减2)=12、1/3(X加1)=1/7(2X减3)、1/4(X加1)=1/3(X减1)、1/2(X减1)=2减1/...
-2(x-2)=12 x-2=-6 x=-3
1/3(x+1)=1/7(2x-3)
7x+7=6x-9 x=-161/4(x+1)=1/3(x-1) 3x+3=4x-4 x=7
1/2(x-1)=2-1/5(x+2) 5x-5=20-2x-4 7x=21 x=3
1/4x-1/2=3/4 1/4x=5/4 x=5
1/6(7X-3)-3X-1/2-1+3X/3=1
5x/3=3/2
x=5/2
6(1/2x—4) 2x=7—(1/3x—1)怎么算?
6(1/2x-4)+2x=7-(1/3x-1)
3x-24+2x=7-1/3x+1
5x-24=8-1/3x
5x+1/3x=8+24
16/3x=32
x=32÷16/3
x=6
解方程1/(x*x+3x+2)+1/(x*x+5x+6)+1/(x*x+7x+12)=1/3x
(1) 1/(x*x+3x+2)+1/(x*x+5x+6)+1/(x*x+7x+12)=1/3x
1/[(x+1)(x+2)]+1/[(x+2)(x+3)]+1/[(x+3)(x+4)]=1/3x
[(x+3)(x+4)+(x+1)(x+4)+(x+1)(x+2)]=1/3x
x²+7x+12+x²+5x+4+x²+3x+2=1/3x
3x²+15x+18=1/3x
9x²+45x+54=x
9x²+44x+54=0
x²+44x=6
x²+44x+22²=484+6
(x+22)²=490
x+22=±7√10
x=±7√10-22
(2)
1/(x*x+3x+2)+1/(x*x+5x+6)+1/(x*x+7x+12)=1/(3x)
1/[(x+1)(x+2)]+1/[(x+2)(x+3)]+1/[(x+3)(x+4)]=1/(3x)
[(x+3)(x+4)+(x+1)(x+4)+(x+1)(x+2)]=1/(3x)
x²+7x+12+x²+5x+4+x²+3x+2=1/(3x)
3x²+15x+18=1/(3x)
9x³+45x²+54x=1
只有一个实数解
x1=0.018240251......
2x乘(1/2x的2次方减1)减3x(1/3x的2次方加2/3)
2x·[(1/2x)²-1] - 3x·[(1/3x)²+2/3]
=[1/(2x)²·2x - 1·2x] - [1/(3x)²·3x + 2/3·3x]
=1/2x - 2x - 1/3x - 2x
=(3-2)/6x - 4x
=1/6x - 4x

解方程1/(x^3+3x+2)+1/(x^3+5x+6)+1/(x^3+7x+12)=1/(x+4)
解:
1/(x+1)(x+2)+1/(x+2)(x+3)+1/(x+3)(x+4)=1/(x+4)
1/(x+1)-1/(x+2)+1/(x+2)-1/(x+3)+1/(x+3)-1/(x+4)=1/(x+4)
1/(x+1)-1/(x+4)=1/(x+4)
1/(x+1)=2/(x+4)
2(x+1)=x+4
2x+1=x+4
2x-x=4-1
x=3
经检验,x=3是原方程的解
1/3X减X怎么算
―3/2x
(1). 3x+2y-6y-x? (2). 7x+(3x-5x)? (3). 1/2(6-4x)-1/3(3-6x)?
(1). 3x+2y-6y-x
=(3x-x)+(2y-6y)
=2x-4y
(2). 7x+(3x-5x)
=7x+3x-5x
=(7+3-5)x
=5x
(3). 1/2(6-4x)-1/3(3-6x)
=(3-2x)-(1-2x)
=3-2x-1+2x
=3-1+(2x-2x)
=2