`1`
`a)(x+5)^2`
`=x^2+10x+25`
`b)(3x-2)^2`
`=9x^2-12x+4`
`c)(4x-1)(4x+1)`
`=(4x)^2-1`
`=16x^2-1`
`d)(x-3)(x+3)`
`=x^2-3^2`
`=x^2-9`
------------------------
Áp dụng HĐT:
`(A+B)^2=A^2+2AB+B^2`
`(A-B)^2=A^2-2AB+B^2`
`A^2-B^2=(A-B)(A+B)`
`a, ( x + 5 )^2 = x^2 + 5^2 + 10x= x^2 + 25 + 10x`
`b, ( 3x - 2 )^2 = ( 3x )^2 - 12x + 2^2 = 9x^2 - 12x + 4`
`c, ( 4x - 1 ) . ( 4x + 1 ) = ( 4x )^2 - 1^2 = 16x^2 - 1`
`d, ( x - 3 ) . ( x + 3 ) = x^2 - 3^2 = x^2 - 9`
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"Những hằng đẳng thức đáng nhớ": 1, Tính (bỏ dấu ngoặc) a, (x+2y)^2 b, (3x-1).(3x+1) c, (2x-y)^2 d, (1/2x+y).(1/2x-y) CTLHN luôn @@
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Giúp mik câu 2 nha mn hứa vote 5 saoo lun
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