Nguyễn Thành Nam
Giới thiệu về bản thân
Haha tự trả lời đi
Thực hiện các phép tính sau:
a) −59+815+−211+4−9+7159−5+158+11−2+−94+157.
b) (72.56)+(76:27)(27.65)+(67:72).
Hướng dẫn giải:
a) −59+815+−211+4−9+715=(−59+−49)+(815+715)+−2119−5+158+11−2+−94+157=(9−5+9−4)+(158+157)+11−2
=−99+1515+−211=9−9+1515+11−2
=−1+1+−211=−1+1+11−2
=0+−211=−211=0+11−2=11−2.
b) (72.56)+(76:27)(27.65)+(67:72)
=(72.56)+(76.72)=(27.65)+(67.27)
=72.(56+76)=27.(65+67)
=72.2=27.2
=7
59+815+−211+4−9+7159−5+158+11−2−59+815+−211+4−9+715=(−59+−49)+(815+715)+−2119−5+158+11−2+−94+157=(9−5+9−4)+(158+157)+11−2
=−99+1515+−211=9−9+1515+11−2
=−1+1+−211=−1+1+11−2
=0+−211=−211=0+11−2=11−2
(72.56)+(76:27)(27.65)+(67:72)
=(72.56)+(76.72)=(27.65)+(67.27)
=72.(56+76)=27.(65+67)
=72.2=27.2
=7
a)-3/8 > 5/-12
b)3131/5252 = 31/52