Toán Lớp 8: Giúp:(
Câu 1
a/ 2x.(3x2y-3x+y)
b/ (x-3)(x+3)
Câu 2
a/12x-3xy+6x2y
b/2x-2y-3x2y+3xy2
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Toán Lớp 8: Giúp:(
Câu 1
a/ 2x.(3x2y-3x+y)
b/ (x-3)(x+3)
Câu 2
a/12x-3xy+6x2y
b/2x-2y-3x2y+3xy2
Comments ( 1 )
a) 2x(3x²y-3x+y)
= 6x³y – 6x² + 2xy
b) (x-3)(x+3)
= x²-9
Câu 2:
a) 12x-3xy+6x²y
= 3x(4-xy+2xy)
b) 2x-2y-3x²y+3xy²
= 2(x-y) – 3xy(x-y)
= (x-y)(2-3xy)