Số bi lấy ra từ bình một là: (40 - 1 x 4) : (3 + 2 + 1) = 6 ( viên)

Lúc đầu số lượng bi trong bốn bình là : ( 6 x 4 + 1 ) x 4 = 100 ( viên )

<=>\(\left(-2\right)^{3n}.4.8^n=\left(-8\right)^n.4.8^n=-4.8^n.8^n=-4.8^{2n}\)

Michiel ...mình nghĩ đây là tính nhanh 

9+9+9=9x3=27

(2x + 1) + (2x + 2) + ... + (2x + 2015) = 0

=> 2x + 2x + ... + 2x + (2015 + 1).2015 : 2 = 0

=> 2015.2x + 2031120 = 0

=> 4030x = -2031120

Ba số x;y;z thoả mãn x-y=8; y-z=10; x+z=12 Khi đó x+y+z là

Put the words correct order to make complete sentences.

1. brown / has / eyes / she / big.
-> She has big brown eyes.

2. gray / a / Mr. Thanh / beard / long / has.
-> Mr.Thanh has a long gray beard.

3. many / are / flowers / garden / in / red / her / there / small.
-> There are many small red flowers in her garden

4. car / is / black / it / big / a.
-> It is a big black car.

9. daughter / blond / has / hair / his / long.
-> Daughter has his long blond hair.

Find the opposite word.

a. dark .........><.............shining

b. ugly .........><.............beautiful

e. long.........><.............short

f. quiet .........><.............noisy

g. straight .......><.............curly

h. weak ...........><...........strong

i. boring ..........><............happy

k. unfriendlly( unfriendly ms đúng ) .......><...............friendly