Toán Lớp 9: 1 + x căn x pt bt sau thanh nt
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Toán Lớp 9: 1 + x căn x pt bt sau thanh nt
Comments ( 2 )
=1³+(√x)³
=(1+√x)[1²-√x+(√x)²]
=(1+√x)(1-√x+x)
x+3√x-4
=x-√x+4√x-4
=√x(√x-1)+4(√x-1)
=(√x+4)(√x-1)