Question

Пж!!! Помогите с 1 (д) и с 5 !!!

Answer 1

1 (д)

$\tt \left(\cfrac{3}{4} +0.9\right):0.3=(0.75+0.9):0.3=1.65:0.3=5.5$

5

$\tt \left(0.02y+4\cfrac{1}{2}\right):1.3+2.7=8.5\\\\\\(0.02y+4.5):1.3=8.5-2.7\\\\(0.02y+4.5):1.3=5.8\\\\ 0.02y+4.5=5.8\cdot1.3\\\\0.02y+4.5=7.54\\\\0.02y=7.54-4.5\\\\0.02y=3.04\\\\y=3.04:0.02\\\\y=152$