Toán Lớp 8: Tính
a) (5x+1)^3
b) (x-2y)^3
c) (4x+5) 16x^2- 20x+25
d) (6x-1/3) (36x^2+ 2x+1/9)
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Toán Lớp 8: Tính
a) (5x+1)^3
b) (x-2y)^3
c) (4x+5) 16x^2- 20x+25
d) (6x-1/3) (36x^2+ 2x+1/9)
Comments ( 2 )
CHÚC BẠN HỌC TỐT!!!!!
a) ($5x^{}$ + $1^{})^{3}$
= $125x^{3}$ + $15x^{}$ + $75x^{}$ + $1^{}$
b) ($x^{}$ – $2y^{})^{3}$
= $x^{3}$ – 6$x^{2}$y + 12x$y^{2}$ – $8y^{3}$
c) ($4x^{}$ + $5^{}$).($16x^{2}$ – $20x^{}$ + $25^{}$)
d) ($6x^{}$ – $\frac{1}{3}$).( $36x^{2}$ + $2x^{}$ + $\frac{1}{9}$ )
= $216x^{}$ – $\frac{1}{27}$