一道方程组2x+3y/2+3x+2y/5=11/33(2x+3y)/2=6(3x+2y)/7+2.5我知道把2x+3y=
来源:学生作业帮 编辑:搜搜考试网作业帮 分类:数学作业 时间:2024/05/14 21:13:42
一道方程组
2x+3y/2+3x+2y/5=11/3
3(2x+3y)/2=6(3x+2y)/7+2.5
我知道把2x+3y=n
3x+2y=m代
但解出来数字很大,
2x+3y/2+3x+2y/5=11/3
3(2x+3y)/2=6(3x+2y)/7+2.5
我知道把2x+3y=n
3x+2y=m代
但解出来数字很大,
n/2+m/5=11/3 (1)
3n/2=6m/7+2.5 (2)
(1)*3-(2)得3m/5=11-6m/7-2.5
51m/35=8.5
m=35/6
代入(1)得n/2+7/6=11/3
n=5
得2x+3y=5 (3)
3x+2y=35/6 (4)
(3)*2,(4)*3得
4x+6y=10 (5)
9x+6y=35/2 (6)
(6)-(5)得5x=7.5
x=1.5
代入(3)得3+3y=5
y=2/3
所以原方程的解x=1.5,y=2/3
3n/2=6m/7+2.5 (2)
(1)*3-(2)得3m/5=11-6m/7-2.5
51m/35=8.5
m=35/6
代入(1)得n/2+7/6=11/3
n=5
得2x+3y=5 (3)
3x+2y=35/6 (4)
(3)*2,(4)*3得
4x+6y=10 (5)
9x+6y=35/2 (6)
(6)-(5)得5x=7.5
x=1.5
代入(3)得3+3y=5
y=2/3
所以原方程的解x=1.5,y=2/3
一道方程组2x+3y/2+3x+2y/5=11/33(2x+3y)/2=6(3x+2y)/7+2.5我知道把2x+3y=
一道二元一次方程组!3(x+y)-4(x-y)=4,(x+y)/2+(x-y)/6=1
解二元一次方程组:{5(x+y)+3(x-y)=2{7(x+y)-3(x-y)=-6
10/x+y+3/x-y=-5 15/x+y-2/x-y=-1(用换元法解此方程组)
y-3x=2,y-5x=4,y-7x=6,y-9x=8,y-11x=0方程组,
x+y/2+x-y/3=6,4(x+y)-5(x-y)=2用加减消元法解方程组
解方程组 {(x+y)/2+(x-y)/3=6 5(x+y)-2(x-y)=4
解方程组 X+Y/2+X-Y/3=6 4[X+Y]-5[X-Y]=2
解方程组 {3(x+y)-4(x-y)=11 {2(x-y)+5(x+y)=27全过程、快
解方程组 {3(x+y)-4(x-y)=11 {2(x-y)+5(x+y)=27
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
2(x+y)-3(x-y)=1 6(x+y)+7(x-y)=51 解方程组