Question

Tính bằng cách nhanh chóng:

a) 367 + 129 + 133 + 371 + 17;

b) 29 + 132 + 237 + 868 + 763;

c) 652 + 327 + 148 + 15 + 73.

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Answer 1

a. 367+129+133+371+17

=(367+133)+(129+371)+17

=500+500+17

=1017

b. 29+132+237+868+763

=29+(132+868)+(237+763)

=29+1000+1000

=2029

c. 652+327+148+15+73

=(652+148)+(327+13)+15

=800+340+15

=1155

Answer 2

a) 367 + 129 + 133 +371 + 17

= ( 367 + 133 ) + ( 129 + 371 ) + 17

= 500 + 500 + 17

= 1017

b) 29 + 132 + 237 + 868 + 763

= ( 132 + 868 ) + ( 763 + 237 ) + 29

= 1000+ 1000 +29

=2029

c) 652 + 327 + 148 + 15 + 73 

= ( 652 + 148 ) + ( 327 + 73 ) + 15

= 800 + 400 + 15

=1215

Answer 3

a) 367 + 129 + 133 + 371 + 17;

=(367+133)+(129+371)+17=500+500+17=1017

b) 29 + 132 + 237 + 868 + 763;

=29+(132+868)+(267+763)=29+1000+1000=2029

c) 652 + 327 + 148 + 15 + 73.

=(652+148)+(327+73)+15=800+400+15=1215

Answer 4

a)\(367+129+133+371+17\\ =\left(367+133\right)+\left(129+371\right)+17\\ =500+500+17=1017\)

b)\(29+132+237+868+763\)

\(=\left(132+868\right)+\left(237+763\right)+29\)

\(=1000+1000+29=2029\)

c)\(652+327+148+15+73\)

\(=\left(652+148\right)+\left(327+73\right)+15\)

\(=800+400+15=1215\)

Answer 5

Tính bằng cách nhanh chóng:

a) 367 + 129 + 133 + 371 + 17

= (367 + 133) + (129 + 371) + 17

= 500 + 500 + 17

= 1000 + 17

= 1017

b) 29 + 132 + 237 + 868 + 763

= (132 + 868) + (237 + 763) + 29

= 1000 + 1000 + 29

= 2000 + 29

= 2029

c) 652 + 327 + 148 + 15 + 73

= (652 + 148) + (327 + 73) + 15

= 800 + 400 + 15

= 1200 + 15

= 1215