4 : a = a : 9 ; x :0.5 = 1:x ; y: 0,1= 0,9:y

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вопрос

This is a series of proportion problems that can be solved using cross multiplication.

For the first proportion a:a=9:9, the ratio is 1:9.

For the second proportion x:0.5=1:x, cross multiplying gives x1=0.5x, which simplifies to x=0.5.

For the third proportion y:0.1=0.9:y, cross multiplying gives y0.9=0.1y, which simplifies to y=0.1.