Question

Tính một cách hợp lí:

a) 17 + 188 + 183;

b) 122 + 2 116 + 278 + 84;

c) 11 + 13 + 15 + 17 + 19.

Answer 1

A 17+188+183

=17+183+188

=   200   +188

=         388

B 122+2116+278+84

=122+278+2116+84

=    400    +    2200

=         2600

Answer 2

a)(17+183)+188=200+188=388

Answer 3

a) 17 + 188 + 183

= (17 + 183) + 188

= 200 + 188

= 388.

b) 122 + 2 116 + 278 + 84

= (122 + 278) + (2 116 + 84)

= 400 + 2 200

= 2 600.

c) 11 + 13 + 15 + 17 + 19

= (11 + 19) + (13 + 17) + 15

= 30 + 30 + 15

= 75.

Answer 4

a) 17 + 188 + 183;

= 17 + 183 + 188

= 388

b) 122 + 2 116 + 278 + 84;

= (122 + 278) + (2116 + 84)

= 2600

c) 11 + 13 + 15 + 17 + 19.

= (11+ 19) + (13 + 17) + 15

= 75

  Nếu thấy đúng thì kết bạn với mình nhé!

Answer 5

a ) 17 + 188 + 183

= ( 183 + 17 ) + 188

= 200 + 188

= 388

b ) 122 + 2116 + 278 + 24

= ( 122 + 278 ) + ( 2116 + 24 )

= 400 + 2140

= 2540

c ) 11 + 13 + 15 + 17 + 19

= ( 11 + 19 ) + ( 13 + 17 ) + 15

= 30 + 30 + 15

= 75

Answer 6

Trả lời :

a) \(17+188+183=\left(17+183\right)+188=200+188=388\)

b) \(122+2116+278+84\)\(=\left(122+278\right)+\left(2116+84\right)\)\(=400+2200=2600\)

c)_\(11+13+15+17+19\)\(=\left(11+19\right)+\left(13+17\right)+15=30+30+15=60+15=75\)

~ HT ~

Answer 7

A 17+188+183 =(17+183)+188 = 200+188 =388 B)122+2116+2718+84 =(122+2718)+(2116+84) =2840+2200 =5040 C)11+13+15+17+19 =(11+19)+(13+17)+15 =30+30+15 =75