Question

зная что 3.4<x<3.5 и 1.4<y<1.5 оцените значения выражения:1)x-2y ;2)5xy; 3)xy-2

Answer 1

1)2,8<2y<3              2)17<5x<17.5

                               *  1.4<y<1.5

                                ---------------

                                  23.8<5xy<26.25

-3<-2y<-2.8

 

3.4< x<3.5                3)3.4<x<3.5

-3<-2y<-2.8                 1.4<y<1.5

---------------                ---------------------

0.4<x-2y<0.7              4.76<xy<5.25                   2.26<xy-2<3.25