Question

РЕШИТЕ ОЧЕНЬ СРОЧНО 6 КЛАСС
а) -20•(х-13)= -220
б) (30-7х)•8= 352
в) 5/12y-3/4= 1/2

Answer 1

$a)\\\\-20*(x-13)=-220 \\-20x+260=-220 -20x=-220-260\\ -20x=-480\\ x=480:20\\ x=24\\\\\\b)\\\\30*8-7x*8=352 \\240-7x*8=352\\ -56x=352-240\\ x=112:-56\\ x=-2\\\\\\v)\\\\ \frac{5}{12} y-\frac{3}{4} =\frac{1}{2} \\\\ 12(\frac{5}{12} y-\frac{3}{4})=\frac{1}{2} *12\\\\ 5y-9=6\\\\ 5y=15\\\\ y=3$