(x-280)/13+(x--420)/13=x/10
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(x-280)/13+(x--420)/13=x/10(x-280)/13+(x--420)/13=x/10(x-280)/13+(x--420)/13=x/10=>(x-280)/13*(10/10
(x-280)/13+(x--420)/13=x/10
(x-280)/13+(x--420)/13=x/10
(x-280)/13+(x--420)/13=x/10
=>(x-280)/13*(10/10)+(x-420)/13*(10/10)=x/10 *(13/13)
=>10(x-280)/130+10(x- 420)/130=13x/130 =>10(x-280)+10(x-420)=13x
=>10x-2800+10x-4200=13x =>20x-13x=2800+4200 => 7x=7000 => x=1000
(x-280)/13+(x--420)/13=x/10
x-2=(104-x)+2 6x-59=10x-75 (x+10)+(x-15)=280-x4（x-62)=x-38 60x-40=(60+20)*(x-5) 32x+32*0.5-25x+64x=24x+496-49x x+15=3*(109-x ) 5(3x-1.4)=2(6x-0.5) 3(x+0.9)=5(x-1.7) 13x-4(2x+5)=17(x-2)-4(2x-1) (13x+8)/3=5x-1x-60=2[(3561-x)+100]+1 (x+9)+12=2[(x-9)-1
题是九个未知数的方程式.5X = 6X = 7X = 8X = 10X = 13X = 14X = 17X = 23X == (X + X + X + X + X + X + X + X + X + 30)≤280提示：题中 5 后面的X是未知数1.6 后面的X是未知数2.7后面的X是未知数3.依次类推.题中（X +
解方程:(x+10)+(x-15)=280-x x+15=3*(109-x) 5(3x-1.4)=2(6x-0.5) 3(x+0.9)=5(x-1.7) 13x-4(...解方程:(x+10)+(x-15)=280-xx+15=3*(109-x) 5(3x-1.4)=2(6x-0.5) 3(x+0.9)=5(x-1.7)13x-4(2x+5)=17(x-2)-4(2x-1)
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