a/ 5/9
b/ 4
c/ 1/2
1. Tính nhanh:
a, 36 . 23 + 62 . 23 + 46
b, 3 . 8 . 76 + 2 . 35 . 12 - 4 . 11 . 6
c, 64 . 23 + 37 . 23 - 23
d, 43 . 11
e, 67 . 99
2. So sánh:
A = 200 . 200 và B = 199 . 201
3. Tìm x:
a, (46 . 51 - x) + 20,57 = 62,4
b, 2018 . x - 2018 = 0
c, x . (x -1) = 0
d, (x + 17) : 4 + 24 = 29
e, 1/5 . 6 + 1/6 . 7 + .......... + 1/49 . x = 1/10
7. Look! Jane ( play ) ............. the guitar. This afternoon, she will play table tennis.
8. I ( not talk ) .............. to her at present.
9. How often .............. she ( go ) ............... fishing?
- She ( go ) .............. once a year.
10. ( Be ) ............. your friends ............... students?
- Yes, they ( be ) .................