Question

sa se afle termenul necunoscut din proportia:

Answer 1

8 8/15=128/15
1 1/3=4/3
1 1/5=6/5
1 2/3=5/3
2,1(3)=(213-21)/90=192/90=64/30=32/15
16⁸/8¹⁰=2³²/2³⁰=2²=4

8 8/15{[1/5+x×(1 1/3-1 1/5)]×1 2/3}/2,1(3)=16⁸/8¹⁰
128/15{[1/5+x(4/3-6/5)]×5/3}/ 32/15=4
128/15{[1/5+x(20-18)/15)]×5/3} ×15/32=4
4(1/5+2x/15×5/3=4
1/5+2x/9=1
2x/9=1-1/5
2x/9=4/5
x/9=2/5
x=18/5
x=3,6