Question

tính nhanh 

a, -(2789 - 435 ) + ( 1789- 1435 )

b, - (-2010) + 36 .41 - 36 . (-59) + (-2010)

c,75 . ( 18 - 65 ) - 65 . ( 75 - 18 )

làm nhanh hộ mình nhé 

thank you

Answer 1

A)

-(2789-435)+(1789-1435)

= -(2000+789-435)+(1000+789-1000-435)

= -2000-789+435+1000+789-1000-435

= -2000 +(789-789)+ (1000-1000) +(435-435)

= -2000

B)

-(-2010)+36.41-36.(-59)+(-2010)

= 2010 +36. (41+59)- 2010

= (2010-2010) +36. 100

= 3600

C)

-75.(18-65)-65.(75-18)

= -75.18+75.65-65.75+65.18

=18. (-75+65)

= 18. (-10)

= -180

Answer 2

a)-2000

b)3600

c)-7230

Answer 3

\(-\left(2789-435\right)+\left(1789-1435\right)\)

\(=-\left(1000+1000+789-435\right)+\left(1000+789-1000-435\right)\)

\(=-1000-1000-789+435+1000+789-1000-435\)

\(=-2000\)

Answer 4

a.-(2789-435)+(1789-1435)

=-2789+435+1789-1435

=(-2789)+435+1789+(-1435)

=[(-2789)+1789]+[435+(-1435)]

=(-1000)+(-1000)

=-2000

Answer 5

b.3600

c.-180

Answer 6

 a.−(2789−435)+(1789−1435)

= −2789+435+1789−1435

= (−2789+1789)+(435−1435)

= −1000+(−1000)=−2000−(2789−435)+(1789−1435)

= −2789+435+1789−1435

= (−2789+1789)+(435−1435)

= −1000+(−1000)

= −2000 

b. −(−2010)+36.41−36.(−59)+(−2010)

= 2010+36.41+36.59−2010

= (2010−2010)+36(41+59)

= 36.100

= 3600 

c, 18+75.65−65.75+65.18

= (−75.18+65.18)+(75.65−65.75)

= 18(65−75)+0

= 18.(−10)

= −180

Answer 7

a . -2000

b . 3600 

c . -180

Answer 8

 a.−(2789−435)+(1789−1435)
= −2789+435+1789−1435
= (−2789+1789)+(435−1435)
= −1000+(−1000)=−2000−(2789−435)+(1789−1435)
= −2789+435+1789−1435
= (−2789+1789)+(435−1435)
= −1000+(−1000)
= −2000 
b. −(−2010)+36.41−36.(−59)+(−2010)
= 2010+36.41+36.59−2010
= (2010−2010)+36(41+59)
= 36.100
= 3600 
c, 18+75.65−65.75+65.18
= (−75.18+65.18)+(75.65−65.75)
= 18(65−75)+0
= 18.(−10)
= −180