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a) ( 768 - 39 ) - 768
= 768 - 39 - 768
= ( 768 - 768 ) - 39
= 0 - 39
= -39
b) ( -1579 ) - ( 12 - 1579 )
= -1579 - 12 + 1579
= ( 1579 - 1579 ) - 12
= 0 - 12
= -12
a) \(\left(768-39\right)-768=768-39-768=768-768-39=0-39=-39\)
b)\(\left(-1579\right)-\left(12-1579\right)=\left(-1579\right)-12+1579=\left[\left(-1579\right)+1579\right]-12=0-12=-12\)
a. (768 - 39) - 768
= 768 - 39 - 768
= 768 - 768 - 39
= 0 - 39
= -39
b. (-1579) - (12 - 1579)
= (-1579) - 12 + 1579
= [(-1579) + 1579] - 12
= 0 - 12
= -12
a) ( 768 - 39 ) -768
= 768 - 39 - 768
= ( 768 - 768 ) -39
= 0 - 39
= -39
b) ( - 1579 ) - ( 12 - 1579 )
= ( - 1579 ) -12 + 1579
= [ ( -1579 ) + 1579 ] -12
= 0 - 12
= -12
tk mn nha!
B1 :
a, = -2-2-2= -6
b, = -2-2-2 = -6
B2:a, = 768-39-768 = (768-768)-39=0-39=-39
b, = -1579-12+1579 = (-1579+1579)-12 = 0-12=-12
k mk nha
\(3)1579-(53+1579)-(53) \)
\(=1579-53-1579+53\)
\(=(1579-1579)-(-53+53)\)
\(=0-0\)
\(=0\)
\(4)2001-15+54-2001-54\)
\(=(2001-2001)+(54-54)-15\)
\(=0+0-15\)
\(=0-15\)
\(=-15\)
a. (768-39)-768
= 768-39-768
= (768-768)-39
= 0-39=-39
b. (-579)-(12-1579)
= -579-12+1579
= (1579-579)-12
= 1000-12=988.
\(5-\left(1997-2005\right)+1997\)
\(=5-1997+2005+1997\)
\(=2010\)
\(1579-\left(53+1579\right)-\left(-53\right)\)
\(=1579-53-1579+53\)
\(=0\)
\(-48-\left(357-48\right)+300\)
\(=\)\(-48-357+48+300\)
\(=-57\)
\(173-\left(36+173\right)+\left(175-27\right)-175-\left(-36+50\right)\)
\(=173-36-173+175-27-175+36-50\)
\(=-27-50\)
\(=-77\)
\(\)
\(-\left[-171+171+23\right]-\left[172-\left(38+172\right)\right]-49\)
\(=171-171-23-172+38+172-49\)
\(=-23+38-49=-34\)
( -1579 ) – ( 12 – 1579 )
= -1579 + 1579 – 12
= 0 – 12
= - 12