a,-(-78-2013)+(78+87)
b,-2020-(-345-89-2020)+11
c,79-(-78+79-456)+22
d,-53+(-76)-(-53)-(-76)
e,789-(-78+789-567)
f,(2-3)-(-3+4)-(-4+5)-(-5+6)
Bỏ ngoặc rồi tính nhé
Ai giúp mình với!
a,-(-78-2013)+(78+87) b,-2020-(-345-89-2020)+11 c,79-(-78+79-456)+22 d,-53+(-76)-(-53)-(-76) e,789-(-78+789-567) f,(2-3)-(-3+4)-(-4+5)-(-5+6) Bỏ ngoặc
By Genesis
a. – ( -78 – 2013 ) + ( 78 + 87 )
= 78 + 2013 + 78 + 87
= ( 78 + 78 ) + ( 2013 + 87 )
= 156 + 2100
= 2256
b. -2020 – ( -345 – 89 – 2020 ) + 11
= -2020 + 345 + 89 + 2020 + 11
= ( -2020 + 2020 ) + ( 89 + 11 ) + 345
= 0 + 100 + 345
= 445
c. 79 – ( -78 + 79 – 456 ) + 22
= 79 + 78 – 79 + 456 + 22
= ( 79 – 79 ) + ( 78 + 22 ) + 456
= 0 + 100 + 456
= 556
d. -53 + ( -76 ) – ( -53 ) – ( -76 )
= -53 – 76 + 53 + 76
= ( – 53 + 53 ) + ( -76 + 76 )
= 0
e. 789 – ( -78 + 789 – 567 )
= 789 + 78 – 789 + 567
= ( 789 – 789) + ( 78 + 567 )
= 0 + 645
= 645
f. ( 2 – 3 ) – ( -3 + 4 ) – ( -4 + 5 ) – ( -5 + 6 )
= -1 – 1 – 1 – 1
= -4
a.$-(-78-2013)+(78+87)^{}$
$=78+2013+78+87$
$=78+78+(2013+87)$
$=78+78+2100$
$=156+2100$
$=2256$
b. $-2020-(-345-89-2020)+11^{}$
$=-2020+345+89+2020+11^{}$
$=(-2020+2020)+(89+11)+345$
$=0+100+345$
$=445$
c. $79-(-78+79-456)+22^{}$
$=79+78-79+456+22$
$=(79-79)+(78+22)+456$
$=0+100+456$
$=556$
d. $-53+(-76)-(-53)-(-76)^{}$
$=-53-76+53+76$
$=(-53+53)+(-76+76)$
$=0$
e. $789-(-78+789-567)^{}$
$=789+78-789+567$
$=(789-789)+78+567$
$=645$
f. $(2-3)-(-3+4)-(-4+5)-(-5+6)^{}$
$=-1-1-1-1$
$=-4$