帮我解两个方程组(1) x/2-x/5=4①x/7-x/15=3②(2) 3(x+y)-4(x-y)=4①x+y/2 +
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帮我解两个方程组
(1) x/2-x/5=4①
x/7-x/15=3②
(2) 3(x+y)-4(x-y)=4①
x+y/2 + x-y/6 =1 ②
quickly 明天要交呀,
(1) x/2-x/5=4①
x/7-x/15=3②
(2) 3(x+y)-4(x-y)=4①
x+y/2 + x-y/6 =1 ②
quickly 明天要交呀,
![帮我解两个方程组(1) x/2-x/5=4①x/7-x/15=3②(2) 3(x+y)-4(x-y)=4①x+y/2 +](/uploads/image/z/17885665-1-5.jpg?t=%E5%B8%AE%E6%88%91%E8%A7%A3%E4%B8%A4%E4%B8%AA%E6%96%B9%E7%A8%8B%E7%BB%84%EF%BC%881%EF%BC%89+x%2F2-x%2F5%3D4%E2%91%A0x%2F7-x%2F15%3D3%E2%91%A1%EF%BC%882%EF%BC%89+3%EF%BC%88x%2By%EF%BC%89-4%EF%BC%88x-y%EF%BC%89%3D4%E2%91%A0x%2By%2F2+%2B)
⑴、⑴÷3-⑵得:
x/42=-5/3,x=-60;
y=-34/5.
⑵、设(x+y)=a,(x-y)=b,
3a-4b=4 (1)
3a-b=1 ⑵
(1)-(2)得:
b=-1,
a=2/3.
x+y=2/3
x-y=-1
x=-1/6
y=5/6
x/42=-5/3,x=-60;
y=-34/5.
⑵、设(x+y)=a,(x-y)=b,
3a-4b=4 (1)
3a-b=1 ⑵
(1)-(2)得:
b=-1,
a=2/3.
x+y=2/3
x-y=-1
x=-1/6
y=5/6
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