Toán Lớp 8: Thực hiện các phép tính sau
a/(4x-1)(3x+2)
b/(x-3)(x+3)- $x^{2}$ +2021
c/ ( $16x^{4}$ $y^{3}$ – $20x^{3}$ $y^{3}$ + $21x^{2}$ $y^{4}$ ) : ( $(2xy)^{2}$
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Toán Lớp 8: Thực hiện các phép tính sau
a/(4x-1)(3x+2)
b/(x-3)(x+3)- $x^{2}$ +2021
c/ ( $16x^{4}$ $y^{3}$ – $20x^{3}$ $y^{3}$ + $21x^{2}$ $y^{4}$ ) : ( $(2xy)^{2}$
Comments ( 2 )
=12x^2+5x-2
b,(x-3)(x+3)-x^2+2021
=x^2-9-x^2+2021
=2012