Question

[Thanh Hoang]

 

hi mọi người 

Answer 1

[GV Nguyễn Trần Thành Đạt]

\(a,\left(-12\right)+28-33=16-33=-17\\ b,\left(-91\right)+\left(-112\right)-\left(-31\right)-\left(-12\right)=-91-112+31+12\\ =\left(-91+31\right)-\left(112-12\right)=-60-100=-160\\ c,\left(-116+301\right)+\left[\left(-401\right)-54\right]=-116+301-401-54\\ =\left(-116-54\right)-\left(401-301\right)=-170-100=-270\\ d,-\left[\left(-112\right)+177\right]-\left(332+23\right)=112-177-332-23\\ =\left(112-332\right)-\left(177+23\right)=-220-200=-420\)

\(e,\left(81-95\right)-\left[\left(-115\right)+111\right]=81-95+115-111\\ =\left(81-111\right)+\left(115-95\right)=-30+20=-10\\ \\ f,\left(124-453\right)+\left[\left(-47\right)-134\right]=124-453-47-134\\ =\left(124-134\right)-\left(453+47\right)=-10-500=-510\\ g,\left(-129\right)-\left[\left(-129\right)+102\right]-98=-129+129-102-98\\ =\left(-129+129\right)-\left(102+98\right)=0-200=-200\\ h,\left[\left(-404\right)-33\right]-\left[\left(-314\right)+127\right]=-404-33+314-127\\ =-\left(404-314\right)-\left(33+127\right)=-90-160=-250\)

Answer 2

[Akai Haruma]

e.

$(81-95)-[(-115)+111]=81-95+115-111=-(111-81)+(115-95)$

$=-30+20=-10$

f.

$(124-453)+[(-47)-134]=124-453-47-134$

$=-(134-124)-(453+47)=-10-500=-510$

g.

$(-129)-[(-129)+102]-98=-129+129-102-98=(-129+129)-(102+98)$

$=0-200=-200$
h.

$[(-404)-33]-[(-314)+127]=-404-33+314-127$

$=-(404-314)-(33+127)=-90-160=-250$