4(x+y)=80 5(x-y)=80过程,

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4(x+y)=805(x-y)=80过程,4(x+y)=805(x-y)=80过程,4(x+y)=805(x-y)=80过程,4(x+y)=805(x-y)=80x+y=80/4=20x-y=80/5

4(x+y)=80 5(x-y)=80过程,
4(x+y)=80 5(x-y)=80
过程,

4(x+y)=80 5(x-y)=80过程,
4(x+y)=80 5(x-y)=80
x+y=80/4=20
x-y=80/5=16
(x+y)+(x-y)=2x=20+16=36
x=18
y=20-x20-18=2
x=18 y=2

x+y=20
x-y=16
2x=20+16=36
2y=20-16=4
x=18
y=2

4(x+y)=80 5(x-y)=80
即x+y=20 (1)
x-y=16 (2)
(1)+(2)
2x=36
x=18
y=20-x=2

x+y=20,x-y=16,两式相加,得:2x=36,x=18,y=2