Question

4, Tính :

a) 11-12+13-14+15-16+17-18+19-20.

b) 101-102-(-103)-104-(-105)-106-(-107)-108-(-109)-110.

MAI MK PHẢI NỘP GẤP , GIÚP MK NHÉ CÁC BẠN !!

Answer 1

a) 11-12+13-14+15-16+17-18+19-20.

=(11-12)+(13-14)+(15-16)+(17-18)+(19-20)

=(-1)+(-1)+(-1)+(-1)+(-1)

=(-1)x5

=-5

Answer 2

b) 101-102-(-103)-104-(-105)-106-(-107)-108-(-109)-110

= 101-102+103-104+105-106+107-108+109-110

=(101-102)+(103-104)+(105-106)+(107-108)+(109-110)

=(-1)+(-1)+(-1)+(-1)+(-1)

=(-1)x5

=-5

Answer 3

a) 11-12+13-14+15-16+17-18+19-20

= (11-12)+(13-14)+(15-16)+(17-18)+(19-20)

= (-1) + (-1) + (-1) + (-1) + (-1)

= (-1) . 5

= -5

b) 101-102-(-103)-104-(-105)-106-(-107)-108-(-109)-110

= 101-102+103-104+105-106+107-108+109-110

= (101-102)+(103-104)+(105-106)+(107-108)+(109-110)

= (-1) + (-1) + (-1) + (-1) + (-1)

= (-1) . 5

= -5

Answer 4

a) 11-12+13-14+15-16+17-18+19-20

= (11-12)+(13-14)+(15-16)+(17-18)+(19-20)

= (-1) + (-1) + (-1) + (-1) + (-1)

= (-1) . 5

= -5

b) 101-102-(-103)-104-(-105)-106-(-107)-108-(-109)-110

= 101-102+103-104+105-106+107-108+109-110

= (101-102)+(103-104)+(105-106)+(107-108)+(109-110)

= (-1) + (-1) + (-1) + (-1) + (-1)

= (-1) . 5

= -5