Question

Tính nhanh nếu có thể :

a) ( 18 + 29 ) + ( 158 - 18 - 29 )

b) ( 13 - 135 + 49 ) - ( 13 + 49 )

Answer 1

a (18+29)+(158-18-29)=18+29+158-18-29=158

b,(13-135+49)-(13+49)=13-135+49-13-49=-135

Answer 2

(18+29)+(158-18-29)

=18+29+158-18-29

=158+(18-18)+(29-29)

=158+0+0

=158

Answer 3

a (18+29)+(158-18-29)=18+29+158-18-29=(18-18)+(29-29)+158=0+0+158=158

B (13-135+49)-(13+49)=13-135+49-13+49=(13-13)+(49-49)+(-135)=0+0+(-135)=-135

Answer 4

(18+29)+(158-18-29)

=18+29+158-18-29

=(18-18)+(29-29)+158

=0+0+158

=158

b,(13-153+49)-(13+49)

=13-153+49-13-49

=(13-13)+(49-49)-153

=0+0-153

=-153

Answer 5

a)(18+29)+(158-18-29)

=18+29+158-18-29

=18+29+158+(-18)+(-29)

=[18+(-18)]+[29+(-29)]+158

=0+0+158

=158

b)(13-135+49)-(13+49)

=13-135+49-13-49

=13+(-135)+49+(-13)+(-49)

=[13+(-13)]+[(-49)+49]+(-135)

=0+0+(-135)

=(-135)

Answer 6

thay 153 thành 153 nha

Answer 7

(13-135+49)-(13+49)

=13+135-49+13-49

=(