Question

7\9-4\13*7\9 70*13\51-13*19\51 x-2\5x=0.6 10/(3\4+x)=5 2500比

Answer 1

79-413*79

=7/9*（1-4/13）

=7/9*9/13

=7/13

70*1351-13*1951

=70*13/51-19*13/51

=（70-19）*13/51

=51*13/51

=13

x-25x=0.6

0.6x=0.6

x=1

10/(34+x)=5

3/4+x=2

x=1.25

2500比2000多几分之几

(2500-2000)÷2000

=500÷2000

=1/4

2000比2500少几分之几

（2500-2000）÷2500

=500÷2500

=1/5