Toán Lớp 6: Tìm y ∈ Z:
a) -12 + y= 5y – 20
b) 5 x (y – 6) – 2 x (y + 3)=12
c) (y + 1) x (y – 2)=4 ∈ ∈ ∈ ∈ ∈ ∈ ∈
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Toán Lớp 6: Tìm y ∈ Z:
a) -12 + y= 5y – 20
b) 5 x (y – 6) – 2 x (y + 3)=12
c) (y + 1) x (y – 2)=4 ∈ ∈ ∈ ∈ ∈ ∈ ∈
Comments ( 2 )
y-5y=12+(-20)
-4y=-8
y=(-8):(-4)
y=2
b) 5 x(y-6)-2 x(y+3)=12
5y-30-(2y+6)=12
5y-30-2y-6=12
3y-36=12
3y=12+36
3y=48
y=48:3
y=16