a) 5 x 3 + 15 = 15 + 15
= 30
b) 4 x 7 – 28 = 28 – 28
= 0
c) 2 x 1 x 8 = 2 x 8
= 16
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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 + 32h.(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)
Đọc tiếp
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)
x = 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 .
x = 2 + 4 + 6 + 8 + 10 + 12 + 14 + 16 + 18 + 20 .
x = 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 .
a) 7 x 5 ..... 7 x 6 ..... 7 x 8 ..... 7 x 4 ..... 35 : 7 ..... 42 : 7 ..... 56 : 7 ..... 28 : 7 .....b) 42 : 7 ..... 35 : 7 ..... 63 : 7 ..... 16 : 2 ..... 14 : 7 ..... 49 : 7 ..... 7 : 7 ..... 48 : 6 ..... 28 : 7 ..... 70 : ..... 21 : 7 ..... 56 : 7 .....
Đọc tiếp
a) 7 x 5 = ..... 7 x 6 = ..... 7 x 8 = ..... 7 x 4 = .....
35 : 7 = ..... 42 : 7 = ..... 56 : 7 = ..... 28 : 7 = .....
b) 42 : 7 = ..... 35 : 7 = ..... 63 : 7 = ..... 16 : 2 = .....
14 : 7 = ..... 49 : 7 = ..... 7 : 7 = ..... 48 : 6 = .....
28 : 7 = ..... 70 : = ..... 21 : 7 = ..... 56 : 7 = .....
Tính nhẩm
6 x 4 = ..... 12 : 6 = ..... 7 x 3 = ..... 63 : 7 = .....
7 x 5 = ..... 42 : 7 = ..... 6 x 8 = ..... 48 : 6 = .....
6 x 6 = ..... 28 : 7 = ..... 7 x 8 = ..... 49 : 7 = .....
Tính nhẩm:a) 2 x 2 ...... 3 x 3 ......2 x 4 ...... 3 x 5 ......2 x 6 ...... 3 x 7 ......2 x 8 ...... 3 x 9 ......4 x 4 ...... 5 x 5 ......4 x 2 ...... 5 x 7 ......4 x 6 ...... 5 x 9 ......4 x 8 ...... 5 x 3 ......b) 200 x 4 ...... 300 x 2 ......200 x 2 ...... 300 x 3 ......400 x 2 ...... 500 x 1 ......100 x 4 ...... 100 x...
Đọc tiếp
Tính nhẩm:
a) 2 x 2 = ...... 3 x 3 = ......
2 x 4 = ...... 3 x 5 = ......
2 x 6 = ...... 3 x 7 = ......
2 x 8 = ...... 3 x 9 = ......
4 x 4 = ...... 5 x 5 = ......
4 x 2 = ...... 5 x 7 = ......
4 x 6 = ...... 5 x 9 = ......
4 x 8 = ...... 5 x 3 = ......
b) 200 x 4 = ...... 300 x 2 = ......
200 x 2 = ...... 300 x 3 = ......
400 x 2 = ...... 500 x 1 = ......
100 x 4 = ...... 100 x 3 = ......
Tính nhanh: (18 - 9 x 2 ) x ( 2 + 4 + 6 + 8 + 10)(18 – 9 x 2) x (2 + 4 + 6 + 8 + 10)(7 x 8 – 56 ) : (2 + 4 + 6 + 8 + 112 )(2 + 125 + 6 + 145 + 112) x (42 – 6 x 7)(12 x 6 – 12 x 4 – 12 x 2) x ( 347 + 125)(a x 7 + a x 8 – a x 15) : (1 + 2 + 3 + …….. + 10)58 – 58 x (6 + 54 – 60)32 + 63 x a x ( a x 1 – a : 1) + 32 x 8 + 32(1 + 2 + 3 + 4 + …. + 9) x (21 x 5 – 21 – 4 x21)(9 x 7 + 8 x 9 – 15 x 9) : (1 + 3 + 5 + 7 + ……..+ 17 + 19)(2 + 4 + 6 + 8 + … + 20) x (56 x 3 – 72 : 9 x 21)Phiền nêu cách làm luôn n...
Đọc tiếp
Tính nhanh:
(18 - 9 x 2 ) x ( 2 + 4 + 6 + 8 + 10)
(18 – 9 x 2) x (2 + 4 + 6 + 8 + 10)
(7 x 8 – 56 ) : (2 + 4 + 6 + 8 + 112 )
(2 + 125 + 6 + 145 + 112) x (42 – 6 x 7)
(12 x 6 – 12 x 4 – 12 x 2) x ( 347 + 125)
(a x 7 + a x 8 – a x 15) : (1 + 2 + 3 + …….. + 10)
58 – 58 x (6 + 54 – 60)
32 + 63 x a x ( a x 1 – a : 1) + 32 x 8 + 32
(1 + 2 + 3 + 4 + …. + 9) x (21 x 5 – 21 – 4 x21)
(9 x 7 + 8 x 9 – 15 x 9) : (1 + 3 + 5 + 7 + ……..+ 17 + 19)
(2 + 4 + 6 + 8 + … + 20) x (56 x 3 – 72 : 9 x 21)
Phiền nêu cách làm luôn nhé, xin cảm ơn
A = (a x 7 + a x 8 - a x 15) : (1 + 2 + 3 + ........ + 10)
B = (18 - 9 x 2) x (2 + 4 + 6 + 8 + 10)
Tính
8 x 1 = ..... 8 x 2 = ..... 8 x 3 = ..... 8 x 4 = .....
1 x 8 = ..... 2 x 8 = ..... 3 x 8 = ..... 4 x 8 = .....
8 x 5 = ..... 8 x 6 = ..... 8 x 7 = ..... 8 x 8 = .....
5 x 8 = ..... 6 x 8 = ..... 7 x 8 = ..... 8 x 9 = .....
Tính nhanh
A = (a x 7 + a x 8 - a x 15) : (1 + 2 + 3 + ........ + 10)
B = (18 - 9 x 2) x (2 + 4 + 6 + 8 + 10)