7x1x7=49
7x2x7=98
7x3x7=147
7x4x7=196
7x5x7=245
7x6x7=294
7x7x7=343
7x8x7=392
7x9x7=441
7x10x7=490
7 x 1 = 7
7 x 2 = 14
7 x 3 = 21
7 x 4 = 28
7 x 5 = 35
7 x 6 = 42
7 x 7 = 49
7 x 8 = 56
7 x 9 = 63
7 x 10 = 70.
7x1x7=49
7x2x7=98
7x3x7=147
7x4x7=196
7x5x7=245
7x6x7=294
7x7x7=343
7x8x7=392
7x9x7=441
7x10x7=490
7 x 1 = 7
7 x 2 = 14
7 x 3 = 21
7 x 4 = 28
7 x 5 = 35
7 x 6 = 42
7 x 7 = 49
7 x 8 = 56
7 x 9 = 63
7 x 10 = 70.
Tính nhanh các biểu thức sau :
a) (45 – 5 x 9) x 1 x 2 x 3 x 4 x 5 x 6 x 7
b) (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10) x (72 – 8 x 8 – 8)
c) (36 – 4 x 9) : (3 x 5 x 7 x 9 x 11)
d) (27 – 3 x 9) : 9 x 1 x 3 x 5 x 7
1 tim x
Ai nhanh to k
x x - 4/7 = 15/20
x x 2/7 -2/3 =1/2
x : 5/4 + 4/5 =2
2 tinh
4/3 x 7/8 x 5
8/9 x 6/5 x 2/3
4/7 : 5/7 x 10/11
8/13 : 7/13 : 4
tính nhanh 7 x 4/9 + 6/ 9 x 5/7 - 5/7 x 1/9 b.1/1 x 3 + 1/3 x 5 + 1/5 x 7 + 1/ 7 x 9 ( mong mn giúp nhó !!!)
Tính :
a) 5 / 6 x 6 / 7 x 7 / 8 : 15 / 16
b) 4 / 7 x 7 / 10 x 3 / 4 : 9 / 20
Tính :
a) 5 / 6 x 6 / 7 x 7 / 8 : 15 / 16
b) 4 / 7 x 7 / 10 x 3 / 4 : 9 / 20
a, X : 1/3 = 4/5
b, X : 3/5 = 7/9
c, X x 3/4 = 7/6
d, 4/8 x X = 9/7
Mẫu : Ta có: 5 x 6 x 7 x 9 = 5 x 6 x 7 x 9 = 5/6
12 7 x 27 6 x 2 x 7 x 9 x 3
a) 3 x 4 x 7 =
12 x 8 x 9
b)4 x 5 x 6 =
12 x 10 x 8
c)5 x 6 x 7=
12 x 14 x 15
Ai nhanh nhất TiCk ChO !
Tính bằng cách thuận tiên nhất:
1):(3/4 x 5/97 + 1/9 x 13/47) x (1/5 - 7/25 x 5/7)
2): 8/17 x 4/15 + 8/17 x 22/15 - 8/15 x 9/17
3): 2021/2 x 1/3 + 4042/4 x 1/5 + 6063/3 x 22/15
4); 4/7 x 2/13 + 8/13 :7/4 + 4/7 : 13/2 + 4/7 x 1/13
5): 2022 x 2021 - 1/ 2021 + 2022 x 2020
6): 18 x 123 + 9 x 4567 x 2 + 3 x 5310 x 6 / (2 + 4 + 6 + 8 + ...+20 + 22) + 48
7): A= 2021 x 2021 x 202020 - 2020 x 2020 x 20212021 / 2020 x 20192019
1/7 + 3 =
1 + 2/5 =
3/4 + 10 =
3/4 x 5/7 =
1/6 x 1/7 =
7/3 x 2/8 =
3/4 x 1/3 =
1/4 x 8/5 =
3/9 x 5/4 =