奇瑞3x (1)3x-2/5=2+3x (2)y-3/6+3-2y=1 (3)10x-20-10x+10/5=3 (4)(x+2)4=(x-2)5
(1)3x-2/5=2+3x (2)y-3/6+3-2y=1 (3)10x-20-10x+10/5=3 (4)(x+2)4=(x-2)5
(1)3x-2/5=2+3x (2)y-3/6+3-2y=1 (3)10x-20-10x+10/5=3 (4)(x+2)4=(x-2)5
(1)3x-2/5=2+3x
两边乘5
3x-2=10+15x
15x-3x=-2-10
12x=-12
x=-1
(2)y-3/6+3-2y=1
两边乘6
y-3+18-12y=6
11y=9
y=9/11
(3)10x-20-10x+10/5=3
10x-20-2x-2=3
8x=25
x=25/8
(4)(x+2)4=(x-2)5
4x+8=5x-10
x=18
1.(5-3X)/2=(3-5X)/3 2.y-(y-10)/2=2-(y+2)/5 3.(x+2)/4-(2x-3)/6=1
1.(5-3X)/2=(3-5X)/3
5/2-3/2x=1-5/3x
5/2-1=(3/2-5/3)x
(9/6-10/6)x=3/2
-1/6x=3/2
x=-3/2*6
x=-9
2.y-(y-10)/2=2-(y+2)/5
y-1/2y+5=2-1/5y-2/5
1/2y+1/5y=2-5-2/5
5/10y+2/10y=-3-2/5.
7/10y=-17/5
y=-17*10/(7*5)
y=-34/7
3.(x+2)/4-(2x-3)/6=1
1/4x+2/4-2/6x+3/6=1
(1/4+2/6)x=1-2/4-3/6
(1/4+2/6)x=0
x=0
4.(x-2)/5-(x+3)/10-(2x-5)/3+3=0
1/5x-2/5-1/10x-3/10-2/3x+5/3+3=0
1/5x-1/10x-2/3x=2/5+3/10-5/3-3
(6/30-3/10-20/30)x=12/30+9/30-50/30-90/30
-17/30x=-119/30
17x=119
x=119/17
x=7
(1)(x-6)*(x-3)(2)(x+1/2)*(x-1/3)(3)(x-1/3)*(3x+2)(4)(3x+2)*(x+2)(5)(4y-1)*(y-5)
(1)(x-6)*(x-3)
=x²-6x-3x+18
=x²-9x+18
(2)(x+1/2)*(x-1/3)
=x²-1/3x+1/2x-1/6
=x²+1/6x-1/6
(3)(x-1/3)*(3x+2)
=3x²+2x-x-2/3
=3x²+x-2/3
(4)(3x+2)*(x+2)
=3x²+6x+2x+4
=3x²+8x+4
(5)(4y-1)*(y-5)
=4y²-20y-y+5
=4y²-21y+5
(6)(x-2)*(x²+4)
=x³-2x²+4x-8
【学习宝典】团队为您答题。有不明白的可以追问!
3x+1/2-2=3x-2/10-2x+3/5
X=20分之19把…………

x-3/4-5x-4=1又1/2 5-2x/4=1-3x/3 y-y-1/2=2-y+2/5 x-2[x-1/2(x-1)]=2/3(x+1)
x-3/4-5x-4=1又1/2
-4x=4+3/4+3/2
x=-25/16
5-2x/4=1-3x/3
3( 5-2x)=4(1-3x)
15-6x=4-12x
6x=-11
x=-11/6
y-y-1/2=2-y+2/5
10y-5y+5=20-2y-4
7y=11
y=11/7
x-2[x-1/2(x-1)]=2/3(x+1)
x-2x+(x-1)=2/3x+2/3
-1-2/3=2/3x
x=-5/2
0.1-0.2x/0.3-1=0.7-x/0.4
1-2x/3-1=7-10x/4
4(1-2x)-12=3(7-10x)
4-8x-12=21-30x
22x=29
x=29/22
3/4-5x=5/6-2/3x
5x-2/3x=3/4-5/6
13/3x=-1/12
x=-1/52
4/(3x-2y)+3/(2x-5y)=10,5/(3x-2y)-2/(2x-5y)=1
令1/(3x-2y)=a,1/(2x-5y)=b
则
4a+3b=10(1)
5a-2b=1(2)
(1)×2+(2)×3
8a+15a=20+3
23a=23
a=1
b=2
所以
1/(3x-2y)=1
1/(2x-5y)=2
则
3x-2y=1(3)
2x-5y=1/2(4)
(3)×2-(4)×3
-4y+15y=2-3/2
11y=1/2
y=1/22
x=4/11
(1){5x-3y=5 6x+2y=6 (2){3x+2y=5x+2 2(3x+2y)=2x+8(3){x+3/3+y+5/3=7 x-4/3+2y-3/5=2
2(3x+2y)=2x+8(3){x+3/3+y+5/3=7 x-4/3+2y-3/5=2
计算 (1)(x-6)(x-3) (x+1/2)(x-1/3) (3x+2)(x+2) (4y-1)(y-5)、 (x-2)(x²+4)
(1)(x-6)*(x-3)=x²-9x+18
(2)(x+1/2)*(x-1/3)=x²-x/6-1/6
(3)(x-1/3)*(3x+2)=3x²+x-2/3
(4)(3x+2)*(x+2)=3x²+8x+4
(5)(4y-1)*(y-5)=4y²-21y+5
(6)(x-2)*(x²+4)=x³-2x²+4x-8
4(x+2)=1-5x 3(y+2)=3-2 y/2+x/3=13 y/3-x/4=3 x+y=420 30%x+40%y=160*180% 2x-1/5+3y-2/4=2 3x+1/3-3y+2/
4x+8=1-5x
(4+5)x=1-8
x=-7/9
3y=1-6
y=-5/3;
y/2=13-x/3
y=26-2x/3
(26-2x/3)/3-x/4=3
-(2/9+1/4)x=3-26/3
x=12
y=26-24/3=18;
y=420-x
0.3x+0.4(420-x)=160*1.8
-0.1x=120
x=-1200
y=1620;
化简可得2x+3y=2.7 x-y=1/6
x=y+1/6 2(y+1/6)+3y=2.7
y=71/150
x=16/25;
化简3x+2y=12 2x+3y=28
两式相减。y-x=16,y=16+x
3x+32+2x=12
x=-4
y=12
4(x-1)>x+2 2x-1/2>或=5x+2/3(2)5x+12>3(x+2)8x-5<3x+10 (3)5(2x-3)>4(3x-2) x-1/4<1-2x/5
解: (1) 4x-4>x+2 -3x>或=7/6 (2) 2x>-6 5x<15 (3)10x-15>12x-8 7/5x<5/4 3x>6 x<或=-7/18 x<-3 x<3 -2x>7 x<25/28 x>2 x<-7/2