Question

Bài 1 tính

a, (\(\dfrac{1}{2}\) x - 3)\(^2\) b, (5x+1)\(^2\) c, (3-4x)\(^2\) d, (2-\(\dfrac{1}{2}\)x)\(^2\)

e, (3x-1) (3x+1) g, (2a-3)\(^2\) h, (4+3x)\(^2\) i, (7- 10x) (7+10x)

giúp mk nha moi người

Answer 1

a) \(\left(\dfrac{1}{2}x-3\right)^2=\dfrac{1}{4}x^2-3x+9\)

b) \(\left(5x+1\right)^2=25x^2+10x+1\)

c) \(\left(3-4x\right)^2=9-24x+16x^2\)

d) \(\left(2-\dfrac{1}{2}x\right)^2=4-2x+\dfrac{1}{4}x^2\)

Answer 2

e) \(\left(3x-1\right)\left(3x+1\right)=9x^2-1\)

g) \(\left(2a-3\right)^2=4a^2-12a+9\)

h) \(\left(4+3x\right)^2=16+24x+9x^2\)

i) \(\left(7-10x\right)\left(7+10x\right)=49-100x^2\)