Yx5+Yx6-Y=420 giup toi giai taon
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Yx 5 + Y x 6 - Y= 420
Y x( 5 x 6 - 1 ) = 420
Y x 10 = 420
Y = 420 :10
Y = 42
Chỗ nào k hiểu cứ hỏi mk nha
yx5+yx6-y=420
=>(y+y-y)x(5+6-1)=420
=>yx10=420
=>y=42