275.(135 –122) – 135.(275 –122) 1 – 2 + 3 – 4 + 5 – 6+ … + 199 – 20 29/10/2021 Bởi Raelynn 275.(135 –122) – 135.(275 –122) 1 – 2 + 3 – 4 + 5 – 6+ … + 199 – 20
a) 275.135-275.122-135.275+135.122 =-275.122+135.122 =122.(-275+135) =122.-140 =-17080 b)=(1-2)+(3-4)…..+199-20 =-1+-1+……+-1+199-20 =100-20 =80 Bình luận
a) 275.135-275.122-135.275+135.122
=-275.122+135.122
=122.(-275+135)
=122.-140
=-17080
b)=(1-2)+(3-4)…..+199-20
=-1+-1+……+-1+199-20
=100-20
=80