a.(454-x)+4³=116

(454-x)+64=116

(454-x)= 116-64

(454-x)=52

x=454-52

x=402

b. Vì 15 chia hết cho x-1 nên x thuộc Ư(15)={1,3,5,15,-1,-3,-5,-15}

x+1=1, x=0

x+1=3, x=2

x+1=5, x=4

x+1=15, x=14

x+1=-1, x=-2

x+1=-3, x=-4

x+1=-5, x=-6

x+1=-15, x=-17

a.(454-x)+4³=116

(454-x)+64=116

(454-x)= 116-64

(454-x)=52

x=454-52

x=402

b. Vì 15 chia hết cho x-1 nên x thuộc Ư(15)={1,3,5,15,-1,-3,-5,-15}

x+1=1, x=0

x+1=3, x=2

x+1=5, x=4

x+1=15, x=14

x+1=-1, x=-2

x+1=-3, x=-4

x+1=-5, x=-6

x+1=-15, x=-17

a.(454-x)+4³=116

(454-x)+64=116

(454-x)= 116-64

(454-x)=52

x=454-52

x=402

b. Vì 15 chia hết cho x-1 nên x thuộc Ư(15)={1,3,5,15,-1,-3,-5,-15}

x+1=1, x=0

x+1=3, x=2

x+1=5, x=4

x+1=15, x=14

x+1=-1, x=-2

x+1=-3, x=-4

x+1=-5, x=-6

x+1=-15, x=-17

a. -127+ 208-73+92

=(-127-73)+(208+92)

= (-200)+300

=100

b. 2353-(473+2153)+(-55+373)

=2353-473-2153-55+373

=(2353+373)-(473+2153+55)

=2726-2618

=45

Topic1:

Dear Kiet,

Tet is my favourite holiday. Before Tet, my family cleans the house and decorates it with flowers. On Tet days, we visit relatives, receive lucky money from the elders, and enjoy traditional dishes together.

With love,

Hung

1. I want to visit Phu Quoc because the beaches are beautiful.

2. There is a movie theatre in my neighbourhood.

1.The jacket is more expensive the shirt.

2. You shouldn't sweep thể floor on the first day on Tet.

3. Let's spend time at the new park.