Câu 1:bỏ dấu ngoặc rồi tính a) (35+75)+(345-35-75) b) (2002-79+15)-(-79+15) c) -(515-80+91)-(2003+80-91) 01/08/2021 Bởi Adeline Câu 1:bỏ dấu ngoặc rồi tính a) (35+75)+(345-35-75) b) (2002-79+15)-(-79+15) c) -(515-80+91)-(2003+80-91)
Câu 1: a, (35+75)+(345-35-75)=35+75+345-35-75=35-35+75-75+345=345 b, (2002-79+15)-(-79+15)=2002-79+15-79-15=-79-79+15-15+2002=1844 c,-(515-80+91)-(2003+80-91)=-515+80-91-2003-80+91=80-80+(-91)+91+(-515)-2003=-2518 Bình luận
a) (35+75)+(345-35-75) = 35+75+345-35-75 = 35-35+75-75+345 = 345 b) (2002-79+15)-(-79+15) = 2002-79+15+79-15 = -79+79+15-15+2002 = 2002 c) -(515-80+91)-(2003+80-91) = -515+80-91-2003-80+91 = 80-80+91-91-515-2003 = -515-2003 = -2518 Xin hay nhất ạ Bình luận
Câu 1:
a, (35+75)+(345-35-75)=35+75+345-35-75=35-35+75-75+345=345
b, (2002-79+15)-(-79+15)=2002-79+15-79-15=-79-79+15-15+2002=1844
c,-(515-80+91)-(2003+80-91)=-515+80-91-2003-80+91=80-80+(-91)+91+(-515)-2003=-2518
a) (35+75)+(345-35-75)
= 35+75+345-35-75
= 35-35+75-75+345
= 345
b) (2002-79+15)-(-79+15)
= 2002-79+15+79-15
= -79+79+15-15+2002
= 2002
c) -(515-80+91)-(2003+80-91)
= -515+80-91-2003-80+91
= 80-80+91-91-515-2003
= -515-2003
= -2518
Xin hay nhất ạ