Question

1517 а, б, в, г. Решите пожалуйста. Даю 20)

Answer 1

$1) 3.5x-2.3x+3.8=4.28 \ 1.2x=4.28-3.8\1.2x=0.48\x=0.4 \ \ 2)4.7y-(2.5y+12.4)=1.9 /*10\ 47y-(25y+124)=19 \ 47y-25y-124=19 \ 22y=19+124 \ 22y=143 \ y=6.5$

$3)(8.3-k)*4.7=5.64 \ 39.01-4.7k=5.64\ 4.7k=39.01-5.64\4.7k=33.37\k=7.1 \ \ 4)(9.2-m)*3.2=16 \ 29.44-3.2m=16\3.2m=29.44-16\3.2m=13.44\m=4.2$