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[ 1 ] x/5+x/4=9/10 [ 2 ] 2x/5-x/3=10 两道解方程...

(1)x/5+x/4=9/10 9/20*x=9/10 x=1/2 (2)2x/5-x/3=10 6x/15-5x/15=10 x/15=10 x=150

(1)2(x+8)=3(x-1) 2x+16=3x-3 x=19 (2)8x=-2(x+4) 8x=-2x-8 10x=-8 x=-4/5 (3)2x-2/3(x+3)=-x+3 6x-2(x+3)=3(-x+3) 6x-2x+3x=6+9 x=15/7 (4)2(10-0.5y)=-(1.5y+2) 20-y=-1.5y-2 0.5y=-2-20 y=-44 设无风时飞机的航速为x (x+24)×(2+...

(1)3x-2=-5 解:两边加上2得 3x=-5+2 3x=-3 x=-1 (2)-5x+2=3x-4 解:移项片 -5x-3x=-4-2 -8x=-6 x=3/4 (3)2x-3(10-x)=5 2x-30+3X=5 2X+3X=5+30 5X=35 X=7 (4)3(x-1)=3-(2x+1) 3X-3=3-3X-1 3X+3X=3-1+3 6x=5 x=5/6 (5)1-3(x+1/3)=1/3 1-3x-...

5/2x+1/4=10/7。x➗5/6=3/8➗25/24 求这两题的解方程 解: 5/2x+1/4=10/7 两边同乘以28, 70x+7=40 70x=33 x=33/70 x÷5/6=3/8÷25/24 x÷5/6=9/25 x=3/10

如果理解你的方程无误 1 x/21=4 x=84 2. 9x-18=6x x=6 3. 8-4x=24 x=-4

第一题有问题 (2)x/2-5x+12/6=1+2x-4/3 (3) x-2/5-x+3/10-2x-5/3+3=0 (4)5x+1/6=9x+1/8-1-x/3 3x-30x+12=6+12x-8 30x- 12-30x+9-60x-50+90=0 -4x+ x/3=1/8-1-1/6 -39x=-14 -60x+37=0 -96x+8x=3-24-4 x=14/39 x=37/60 -88x=-25 x=25/88

1/1x2+1/2x3+1/3x4+1/4x5+……1/8x9+1/9x10 =1-1/2+1/2-1/3+1/3-1/4+....+1/8-1/9+1/9-1/10 =1-1/10 =9/10

2(x+1)-3(x-2)=4+x 2x+2-3x+6=4+x -x+8=4+x x+x=8-4 2x=4 x=2 5(x+2)=2(2x+7) 5x+10=4x+14 5x-4x=14-10 x=4 x-2[x-3(x-1)]=8 x-2(x-3x+3)=8 x+4x-6=8 5x=8+6 5x=14 x=2.8 4x-3(20-x)=6x-7(9-x) 4x-60+3x=6x-63+7x 7x-60=13x-63 13x-7x=63-60 6x=...

2(0.4x+4)-5(0.3x-7)=9 0.8x+8-1.5x+35=9 0.8x-1.5x=9-8-35 -0.7x=-34 x=340/7 3/4[4/3(1/2x-1/4)-8]=3/2x 1/2x-1/4-6=3/2x 1/2x-3/2x=6+1/4 -x=25/4 x=-25/4 (3x-2)/5+2=-(x+6)/5 3x-2+10=-x-6 3x+x=-6+2-10 4x=-14 x=-7/2

2(3-y)=5-4(y+5) 6-2y=5-4y-20 21=-2y y=-10.5 (2x+1)/6+(x-1)/3=1 2x+1+2x-2=6 4x=7 x=7/4 60%x-(x+3)*50%=3 0.6x-0.5x-1.5=3 0.1x=1.5 x=15

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