Решить уравнения 2,75/ (1/4+2/5x)=1/2 (2/3x+20*3/2)=43,3

2,75/ (1/4+2/5x)=1/21/4+2/5 х=2,75:1/21/4+2/5 х=11/22/5 х=11/2-1/42/5 х=21/4 х=21/4:2/5 х=105/8=13,125 (2/3x+20*3/2)=43,32/3 х +30=43,32/3 х=43,3-302/3 х=13,3 х=13,3:2/3 х=399/20=19,95