Question

решите уравнение под цифрой 2

Answer 1

(68,7+х): 28 1/90 = 3
(68,7+х) = 3 * 28 1/90
(68,7+х)=3* 2521/90
(68,7+х)=2521/30
х=2521/30-68 7/10
х=2521/30-687/10
х=2521/30-2061/30
х=460/30 = 15 1/3