Question

Упростите и найдите значение вырожение 1/3x+3/4x-4/9x при 1 13/23; 9/46

Answer 1

1/3x+3/4x-4/9x при 1 13/23; 9/46
1) 1/3+3/4=4/12+9/12=13/12
2)13/12-4/9=39/36-16/36=23/36
3)при x= 1 13/23
23/36x=23/36×1 13/23=
1 13/23=(13+1×23)/23=36/23
23/36×36/23=1
4) при x=9/46
23/36x=23/36×9/46=1/4×1/2=1/8