Toán Lớp 6: Em muốn hỏi là (-2019)-(234-2019)= (116+124)+(215-116-124= (435-167-89)-(435-84=

Question

Toán Lớp 6:  Em muốn hỏi là (-2019)-(234-2019)= (116+124)+(215-116-124= (435-167-89)-(435-84=

kymmailien · Answer

(-2019) - (234 - 2019)   = (-2019) - 234 + 2019   = [(-2019) + 2019] - 234   = 0 - 234   = -234   (116 + 124)+(215-116-124)   = 116 + 124+215-116-124   = (116-116)+(124-124)+215   = 215   (435-167-89)-(435-84)   =435-167-89-435+84   =(435 -435)+(-89-84)-167   =0+4-167   = 172

mytamhoang · Answer

( -2019 ) - ( 234 - 2019 )    = -2019 - 234 + 2019   = ( -2019 + 2019 ) - 234   = 0 - 234   = -234   $ text{ _______________________ }$   ( 116 + 124 ) + ( 215 - 116 - 124 )   = 116 + 124 + 215 - 116 - 124   = ( 116 - 116 ) + ( 124 - 124 ) + 215   = 0 + 0 + 215   = 215   $ text{ _____________________________ }$   ( 435 - 167 - 89 ) - ( 435 - 84 )   = 435 - 167 - 89 - 435 + 84   = ( 435 - 435 ) + ( -89 + 84 ) - 167   = 0 + ( -5 ) - 167   = -5 - 167   = 172