Уравнения номер 1198 (15 баллов)

Ответ:

Пошаговое объяснение:

$1) 3\frac{1}{5}x+2.9x=36.6\\ 3\frac{2}{10}x+2\frac{9}{10} = 36.6\\ 6\frac{1}{10}x =36.6\\ x=36.6 / 6.1\\ x = 6$

$2)5.6x-2.4x=4.8\\3.2x=4.8\\x=4.8/3.2\\x=1.5$

$3)9x-7\frac{9}{20}x = 4.03\\8\frac{20}{20}x -7\frac{9}{20}x =4.03\\1\frac{11}{20}x =4.03\\x=4\frac{3}{100} /1\frac{11}{20} \\x=4\frac{3}{100} /1\frac{55}{100} \\x=2\frac{6}{100}\\x=2.6$

$4)(x+2.6)/0.8=7.45\\x+2.6=7.45*0.8\\x+2.6=5.96\\x=5.96-2.6\\x=3.36$

$5)(7.8-y)/6.1=0.2\\7.8-y=0.2*6.1\\7.8-y=1.22\\y=7.8-1.22\\y=6.58$

$6)16.5/(7.6-y)=5\\7.6-y=16.5/5\\7.6-y=3.3\\y=7.6-3.3\\y=4.3$

А спасибо?))))