x/3-y/7=1/2 x/3+y/7=1/3用加减法怎么解?
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x/3-y/7=1/2x/3+y/7=1/3用加减法怎么解?x/3-y/7=1/2x/3+y/7=1/3用加减法怎么解?x/3-y/7=1/2x/3+y/7=1/3用加减法怎么解?x/3-y/7=1/
x/3-y/7=1/2 x/3+y/7=1/3用加减法怎么解?
x/3-y/7=1/2 x/3+y/7=1/3用加减法怎么解?
x/3-y/7=1/2 x/3+y/7=1/3用加减法怎么解?
x/3-y/7=1/2 x/3+y/7=1/3
相加
x/3+x/3=1/2+1/3
2x/3=5/6
x=5/4
相减
y/7+y/7=1/3-1/2
2y/7=-1/6
y=-7/12
x=5/4,y=-7/12
是同类项则x和y系数相等
所以2n-1=8
n=9/2
所以(1-n)^2000(n-59/14)^2000
=(-7/2)^2000(2/7)^2000
=(-7/2×2/7)^2000
=1^2000
=1
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