1. Rút gọn

a, A=(4x+3y)² + (4x-3y)²

b,B=(x-2³)-(x+2)³

c,C=(x+2y)²+2.(x+2y) (x-2y) + (x-2y)²

2. Tìm x

a, x²+12x+36=0

b,16x²-8x+1=0

c,x³+3x²+3x+1=0

1.Rewrite the sentence so that its children next month.

1.They will build a new school for poor children next month.

\(\rightarrow\)A mew school........

2.I always go to school on time.

\(\rightarrow\)I am.........

3.Lan spends thirty minutes a day to practicing the piano.

\(\rightarrow\)Praciticing.......

4.My sister is more hars-working than me.

\(\rightarrow\)I don't........

1. Rút gọn

a, A=(4x+3y)² + (4x-3y)²

b,B=(x-2³)-(x+2)³

c,C=(x+2y)²+2.(x+2y) (x-2y) + (x-2y)²

2. Tìm x

a, x²+12x+36=0

b,16x²-8x+1=0

c,x³+3x²+3x+1=0

1. Fill in the bank "br" or "pr"

1....incess

2....ing

3....idgt

4....ess

5....epare

6....avery

Diện tích hình chữ nhật là:

a,15.91,5 + 150.0,85

= 15.91,5 + 15.10.0,85

= 15.91,5 + 15.8,5

= 15.100

= 1500

b,x(x – 1) – y(1 – x)

= x(x – 1) – y[–(x – 1)]

= x(x – 1) + y(x – 1)

Tại x = 2001, y = 1999, giá trị biểu thức bằng:

(2001 – 1)(2001 + 1999) = 2000.4000 = 8000000

(1,3,5,7,15,21,35,105)