câu 1
a)100+2015^2015÷2015^2014 -[(23+77)÷10²+18+2015^0]^0
=100+2015-1
=2115-1
=2114
b)(-23)+24-(-66)+(-91)-24
=(-23)+24+66+(-91)+(-24)
=[24+(-24)] + (-23)+66+(-91)
=0+(-23)+66+(-91)
=(-23)+66+(-91)
=43+(-91)
=-48
a)416-x=354
x=416-354
x=62
c)-4≤x<0
x∈{-4; -3; -2; -1}
bài 3
a)
A=(3+5)²
A=8²=64
B=3²+5²
B=9+25=34
=>A<B
b)
C=(3+5)³
C=8³=512
D=3³+5³
D=27+125=152
=>C>D
