127-(245-34+127)+245-34
=127-245+34-127+245-34
=[127+(-127)]+[245+(-245)]+[34+(-34)]
=0+0+0
=0
127-(245-34+127)+245-34
=127-245+34-127+245-34
=(127-127)+[(-245)+245]+(34-34)
=0+0+0
=0
Các câu hỏi tương tự
A group of students, including boys and girls are very close, anytwo of you in the group are close friends. The guys say to each other that we each have some guys with some female friends. Andthe girls say to each other that we each have twice the number ofmen you girls. (Note: Some friends of each person included in thegroup). That group of students asked how many of you men, how many girls?
Đọc tiếp
A group of students, including boys and girls are very close, anytwo of you in the group are close friends. The guys say to each other that we each have some guys with some female friends. Andthe girls say to each other that we each have twice the number ofmen you girls. (Note: Some friends of each person included in thegroup). That group of students asked how many of you men, how many girls?
Some have only one single conventionitself
yet there are countless number of multiples
1. Tính nhanh
a) (127-34) - ( 127 - 54 - 34 )
Tính: a) 1074 + 253;b) |-123| + |-75|; c) 245 + |-34| d) (-34)+ (-45).
Bài 1:
a) (-127).57 + (-127).43
b) -13 .34 - 87.34
c)(-25).68 + (-34).(-250)
d)1 - 2 - 3 +4 +5 -6 -7 +........+97 -98-99 +100
Bài 1: Thực hiện các phép tính sau một cách hợp lý:
a/ (-14).(-125).(+3).(-8)
b/ (-127).57+(-127).43
c/ (-13).34-87.34
d/ (-25).68+(-34).(-250)
tính
(-34)+(-91)+(-26)+(-99)
|-82|+(-120)
125+|-25\
(-127)+|-115|
Bài 1 Tính
(26-6).(-4)+31.(-7-13)
(-13).34-87.34
(-127).57+(-127).43
(37-17).(-5)+24.(-13-17)
Thực hiện phép tính rồi so sánh: a) 245 + (-12) và 124; b) (-234)+ 45 và -234; c) (-34) + (-56) và -34; d) 17 + (-35) và -17 + 35