Question

Пж!!! Помогите с 1 (д) и с 5 !!!

Answer 1

1 (д)

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

5

$tt left(0.02y+4cfrac{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=5.8cdot1.3\\0.02y+4.5=7.54\\0.02y=7.54-4.5\\0.02y=3.04\\y=3.04:0.02\\y=152$