1.Tìm X thuộc Z biết:

a.(-4).

b.3.(2.X+8)-(5.X+2)=0

c. 5.(7-3.X)+7.(2+2.X)=0

2.CM các đẳng thức sau:

a) x.(y+z)-y.(x-z)=(x+y).z

b) x.(y-z)-x.(y+a)= -x.(z+a)

1. Cho a=-20, b-c=-5

Hãy tìm giá trị của M, biết:

 =b.(a-c)-c.(a-b)

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