Toán Lớp 8: 1, Tính (bỏ dấu ngoặc): a, (2x+1)^2 b, (3x-2).(3x+2) c, (x-1/2)^3 d, (3x+4).(9x^2-12x+16) e, (3x-1/2)^2 g, (2x+1)^3 h, (x-1).(x^2+x+1) -

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Toán Lớp 8: 1, Tính (bỏ dấu ngoặc): a, (2x+1)^2 b, (3x-2).(3x+2) c, (x-1/2)^3 d, (3x+4).(9x^2-12x+16) e, (3x-1/2)^2 g, (2x+1)^3 h, (x-1).(x^2+x+1)

Huyền Trâm Tháng Một 20, 2023 Toán học 1 Comment 0 views

Toán Lớp 8: 1, Tính (bỏ dấu ngoặc):
a, (2x+1)^2
b, (3x-2).(3x+2)
c, (x-1/2)^3
d, (3x+4).(9x^2-12x+16)
e, (3x-1/2)^2
g, (2x+1)^3
h, (x-1).(x^2+x+1)
CTLHN LUÔN @@!!!

Comments ( 1 )

chauhoangmy98
20 Tháng Một, 2023 at 3:59 sáng

Reply

a)

(2x+1)^2

=(2x)^2+2.2x.1+1^2

=4x^2+4x+1

b)

(3x-2)(3x+2)

=(3x)^2-2^2

=9x^2-4

c)

(x-1/2)^3

=x^3-3.x^2 . 1/2+3.x. (1/2)^2-(1/2)^3

=x^3-3/x^2+3/4x-1/8

d)

(3x+4)(9x^2-12x+16)

=(3x)^3+4^3

=27x^3+64

e)

(3x-1/2)^2

=(3x)^2-2.3x. 1/2+(1/2)^2

=9x^2-3x+1/4

g)

(2x+1)^3

=(2x)^3+3.(2x)^2 .1+3.2x.1^2+1^3

=8x^3+12x^2+6x+1

h)

(x-1)(x^2+x+1)=x^3-1

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