Toán Lớp 6: 234+(-117)+(-100)+(-234) 100:{250:[450-(4.5 mũ 3-2 mũ 2.250)]} 11-12+13-14+15-16+17-18+19-20 (2021)-(57-2021) giúp với ạ

Question

Toán Lớp 6:  234+(-117)+(-100)+(-234) 100:{250:[450-(4.5 mũ 3-2 mũ 2.250)]} 11-12+13-14+15-16+17-18+19-20 (2021)-(57-2021) giúp với ạ

buithaianh98 · Answer

1)  234+(-117)+(-100)+(-234)    = 234-117-100-234   = (234-234)-(117+100)   = 0-217   = -217   2)  100:{250:[450-(4.5^3-2^2 .250)]}    = 100:{250:[450-(4.125-4 .250)]}     = 100:{250:[450-(500-1000)]}     = 100:{250:[450--500]}     = 100:(250:950)     = 100: 5/19     = 380    3) 11-12+13-14+15-16+17-18+19-20   = (11-12)+(13-14)+(15-16)+(17-18)+(19-20)   = (-1)+(-1)+(-1)+(-1)+(-1)   = -(-1 + -1 + -1+ -1+ -1)   = -(1+1+1+1+1)   = -5   4)  (2021)-(57-2021)    = 2021&minus;57+2021     = (2021&times;2)&minus;57     = 4042&minus;57     =3985     #Karis257

truongthanhhung · Answer

*Giải đáp + giải th&iacute;ch c&aacute;c bước giải :     234+(-117)+(-100)+(-234)   =[234+(-234)]+[(-117)+(-100)]   =0+(-217)   =-217   --------------------------------------   100:{250:[450-(4.5^3-2^2. 250)]}   =100:{250:[450-(4.125-4. 250)]}   =100:{250:[450-(500-1000)]}   =100:{250:[450-(-500)]}   =100:{250:[450+500)]}   =100:{250:950}   =100:5/19   =100xx19/5   =1900/5=380   --------------------------------------   11-12+13-14+15-16+17-18+19-20   = (11 - 12) + (13 - 14) + (15 - 16) + (17 - 18) + (19 - 20)   = (-1) + (-1) + (-1) + (-1) + (-1)   = (-1) xx 5   = -5   -------------------------------------   (2021)-(57-2021)   =2021-57+2021   =(2021xx2)-57   =4042-57   =3985   -------------------------------------   #Blue