“x/3+y/4=54/60① x/5+y/4=42/60②”怎样解?
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![“x/3+y/4=54/60① x/5+y/4=42/60②”怎样解?](/uploads/image/z/2489384-56-4.jpg?t=%E2%80%9Cx%2F3%2By%2F4%3D54%2F60%E2%91%A0+x%2F5%2By%2F4%3D42%2F60%E2%91%A1%E2%80%9D%E6%80%8E%E6%A0%B7%E8%A7%A3%3F)
“x/3+y/4=54/60① x/5+y/4=42/60②”怎样解?
“x/3+y/4=54/60① x/5+y/4=42/60②”怎样解?
“x/3+y/4=54/60① x/5+y/4=42/60②”怎样解?
x/3+y/4=54/60 (1)
x/5+y/4=42/60 (2)
(4x+3y)/12=54/60 (3)
(4x+5y)/20=42/60 (4)
(4x+3y)=54/5 (5)
(4x+5y)=42/3 (6)
5*(4x+3y)=54 (7)
3*(4x+5y)=42 (8)
20x+15y=54 (9)
12x+15y=42 (10)
8x=12
x=1.5
15y=54-30=24
y=1.6