Nguyễn Thanh Long
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2024-03-10 20:37:19
2024-03-10 20:36:34
2023-12-13 21:37:14
a) <=>3x.(x-1)+(x-1)=0
<=>(x-1).(3x+1)=0=>x-1=0 ; 3x+1=0
<=>x=1 ;x= \(\dfrac{1}{3}\)
b)x2-9x=0<=>x.(x-9)=0
=>x=0 ; x-9=0
<=>x=0 ; x=9
2023-12-13 20:48:22
a)x2-10x+25=x2-2.x.5+52
=(x-5)2
b)(-8y+x).(-8y-8y.x+x)=(-8y+x).(-8y-8xy+x)
2023-12-13 20:36:21
a) (2x + 1)2=(2x2) + 2.2x.1+ 12
=4x2+4x+1
b)( a+ \(\dfrac{b}{2}\))3=a3+3.a2.\(\dfrac{b}{2}\)+3.a.(.\(\dfrac{b}{2}\))2+(\(\dfrac{b}{2}\))3
=a3+\(\dfrac{3}{2}\)a2b+\(\dfrac{3}{4}\)ab2+\(\dfrac{b}{8}\)
2023-11-12 15:23:24
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