Question

1.56-1.3+2.44-0.3怎么简便

Answer 1

1.56-1.3+2.44-0.3

=(1.56+2.44)-(1.3+0.3)

=4-1.6

=2.4

100-99+98-97+……+24-23+22-21

=(100-99)+(98-97)+……+(24-23)+(22-21 )

=1+1+……+1+1 （总共79个）

=1×79

=79