Tính nhẩm
9 x 5 =
63 : 7 =
8 x 8 =
5 x 7 =
8 x 7 =
3 x 8 =
40 : 5 =
5 x 5 =
7 x 5 =
7 x 8 =
6 x 4 =
45 : 9 =
7 x 7 =
35 : 5 =
56 : 8 =
2 x 8 =
81 : 9 =
9 x 9 =
35 : 7 =
56 : 7 =
tính nhanh :
a, 53 + 8 + 53 + 53 c, ( 8 + 8 x 7 - 9 ) x ( 9 x 9 - 81 )
b, 24 x 2 x 2 + 2 x 12 x 6 d, ( 15 x 3 - 11 x 2 - 10 ) x ( 405 : 5 - 81 )
Tính nhanh :
a, 53 + 8 + 53 + 53 c, ( 8 + 8 x 7 - 9 ) x ( 9 x 9 - 81 )
b, 24 x 2 x 2 + 2 x 12 x 6 d, ( 15 x 3 - 11 x 2 - 10 ) x ( 405 : 5 - 81 )
Tính nhanh :
a, 53 + 8 + 53 + 53 c, ( 8 + 8 x 7 - 9 ) x ( 9 x 9 - 81 )
b , 24 x 2 x 2 + 2 x 12 x 6 d, ( 15 x 3 - 11 x 2 - 10 ) x ( 405 : 5 - 81 )
a .(18 – 9 x 2) x (2 + 4 + 6 + 8 + 10)
b.(7 x 8 – 56 ) : (2 + 4 + 6 + 8 + 112)
c. (2 + 125 + 6 + 145 + 112) x (42 – 6 x 7)
d.(12 x 6 – 12 x 4 – 12 x 2) x ( 347 + 125)
e(a x 7 + a x 8 – a x 15) : (1 + 2 + 3 + ........ + 10)
f.58 – 58 x (6 + 54 – 60)
g.32 + 63 x a x ( a x 1 – a : 1) + 32 x 8 + 32
h.(1 + 2 + 3 + 4 + .... + 9) x (21 x 5 – 21 – 4 x21)
i.(9 x 7 + 8 x 9 – 15 x 9) : (1 + 3 + 5 + 7 + ........+ 17 + 19)
k.(2 + 4 + 6 + 8 + ... + 20) x (56 x 3 – 72 : 9 x 21)
Tìm x:
a. x – 137 = 542
b) 81 : x = 9
c) 8 x x = 72
d) x : 4 = 75 + 21
1 x 9 = 9
2 x 9 = 18
3 x 9 = 27
4 x 9 = 36
5 x 9 = 45
6 x 9 = 54
7 x 9 = 63
8 x 9 =72
9 x 9 = 81
10 x 9 = 90
Câu hỏi là : 9 + 18 + 27 + 36 + 45 + 54 + 63 + 72 + 81 +90 =????
Tính nhẩm:
9 x 6 =
9 x 7 =
9 x 8 =
9 x 9 =
54 : 9 =
63 : 9 =
72 : 9 =
81 : 9 =
Tính nhẩm
9 x 2 = ...... | 9 x 3 = ...... | 9 x 4 = ...... | 9 x 5 = ...... |
18 : 9 = ...... | 27 : 9 = ...... | 36 : 9 = ...... | 45 : 9 = ...... |
9 x 6 = ...... | 9 x 7 = ...... | 9 x 8 = ...... | 9 x 9 = ...... |
54 : 9 = ...... | 63 : 9 = ...... | 72 : 9 = ...... | 81 : 9 = ...... |