x+y+z=26 x-y=1 2x-y+z=18解三元一次方程组; 我们没学呢、
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x+y+z=26x-y=12x-y+z=18解三元一次方程组;我们没学呢、x+y+z=26x-y=12x-y+z=18解三元一次方程组;我们没学呢、x+y+z=26x-y=12x-y+z=18解三元一
x+y+z=26 x-y=1 2x-y+z=18解三元一次方程组; 我们没学呢、
x+y+z=26 x-y=1 2x-y+z=18
解三元一次方程组;
我们没学呢、
x+y+z=26 x-y=1 2x-y+z=18解三元一次方程组; 我们没学呢、
x+y+z=26.(1)
x-y=1 .(2)
2x-y+z=18 .(3)
(1)-(2)得-x+2y=8.(4)
(2)+(4)得y=9
将y=9代入(2)得x-9=1
x=10
将x=10,y=9代入(1)得10+9+z=26
z=7
所以原方程的解为:x=10,
y=9
z=7
y 等于9..x 等于10..z 等于7..
x+y+z=26 (1)
x-y=1 (2)
2x-y+z=18(3)
(1)+(2)=2x+z=27 (4)
(1)+(3)=3x+2z=44(5)
(5)-2*(4)=-x=-10得出x=10
代入(2)得y=9
代入(1)得z=7
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计算题!【x+y+z=26;x-y=1;2x-y+z=18】!【x/3+y/5;x/2-2y/5=1】