Toán Lớp 7: (x-3/5).(18/5-4/5.x)=0
5x.(x-1/3)=0
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Toán Lớp 7: (x-3/5).(18/5-4/5.x)=0
5x.(x-1/3)=0
Comments ( 2 )
Gửi ak
(x-3/5).(18/5-4/5 . x)=0
=>[(x-3/5=0),(18/5-4/5.x=0):}
=>[(x=0+3/5),(4/5.x=18/5-0):}
=>[(x=3/5),(4/5.x=18/5):}
=>[(x=3/5),(x=18/5:4/5):}
=>[(x=3/5),(x=18/5 . 5/4):}
=>[(x=3/5),(x=9/2):}
Vậy x\in{3/5;9/2}
b)
5x.(x-1/3)=0
=>[(x=0),(x-1/3=0):}
=>[(x=0),(x=0+1/3):}
=>[(x=0),(x=1/3):}
Vậy x\in{0;1/3}