a)(454-x)+4^3=116

454-x+64 =116

454-x =116-64

454-x =52

x =454-52

x =402

Vậy x =402

b)15chia hết cho x +1 với x là số tự nhiên.

Giải

Các ước của 15 là 1,3,5,15

Vì 15 chia hết cho x + 1,nên x + 1 là một trong các ước trên

x +1thuộc {1,3,5,15}

Nếu x+1=1,thì x=1-1=0

Nếu x+1=3,thì x=3-1=2

Nếu x+1=5,thì x=5-1=4

Nếu x+1=15,thì x=15-1=14

Tất cả các giá trị tìm được (0,2,4,14)đều là số tự nhiên

Vậy x thuộc {0,2,4,14}

a)-127+208-73+92

=-127-73+208+92

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

=-200+300

=300-200

=100

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

=2353-473-2153-55+373

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

=200+(-100)-55

=200-100-55

=100-55

=45

Topic1: Hi,linh

How are you? Tet is coming soon,and my family is very busy.We clean the house,decorate with peach blossoms,and make banh chung.My mom cooks many delicious dishes,and we visit our grandparents and receive lucky money.It's my favorite holiday!

Best

khoi my

Topic2: I really like my neighbourhood because it's very peaceful and clean.People friendly and there's a lovely park nearby where I can relax.However,I like that there are no big supermarkets,go shopping for grocernies car be in convenient.I wish there were more shops around.

Topic3: I realy want to visit Ha Long Bay in Vietnam.It looks incredibly beautiful with its emerald waters and thousands of limestone islands.I want to take aboat tour to explore the caves and enjoy the stunning scenery.I think it would be a very peaceful and memorable experience.I hope I can go there next summer

1.I want be visit be the beaches because Phu Quoc beautiful.

2.There be new movie theatre my neighbourhood.

1.I want be visit be the beaches because Phu Quoc beautiful.

2.There be movie theatre new my neighbourhood.

1.the jacket is more expensive than the shirt

2.you shouldn't sweep floor day of Tet

3. Let's spend time at the new park