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2x²-1=49

2x²   =49+1

2x²   =50

  x²   =50:2

  x²   =25

  x²   =5²

  x    =5

Vậy x=5

Ex1:compete the sentences with the corect word. You can see the first letter of each word

I usually (1)c....... to school. I have an old bike so I don't worrry about it. Sometimes when it is rainning, I go to school (2)b...... car. At the weekend, I usually go to my friend's house. He lives fifty menters away from me so I can (3)w.......... there in one minute. I often visit my grandparents. They live on the fourth floor. I usually (4)t......... the elevator, but sometimes it doesn't (5)t......... and I (6)w..........(7)u............ the (8)s.......... . It's good exercise .

bài 1

a)a+5  a-2              b)3.a  a-1

c)5.a-8  a-4            d)a²+a+2  a+1

bài 2

a)4n-3  n                 b)-13 là bội của 2n-1

Hãy chỉ ra và phân tích tác dụng của 2 hình ảnh so sánh trong văn bản "Vượt thác "

GIÚP MK NHA.THANK YOU<3<3