2a+1=8
2a=8-1=7. 7:2=3,5
czyli a= 3 1/2
[tex]5a = 3 \frac{3}{4} [/tex]
[tex]a = \frac{15}{4} \times \frac{1}{5} = \frac{3}{4} [/tex]
czyli a= 3/4
[tex]a \div 6 = 1 \frac{2}{3} [/tex]
[tex]a = 1 \frac{2}{3} \times 6 = 6 \frac{12}{3} = 10[/tex]
czyli a =10
[tex]1 \frac{1}{4} + a = 1 \frac{3}{8} [/tex]
[tex]a = 1 \frac{3}{8} - 1 \frac{1}{4} = 1 \frac{3}{8} - 1 \frac{2}{8 } = \frac{1}{8} [/tex]
czyli a= 1/8
[tex]a - 2 \frac{1}{4 } = 1 \frac{1}{2} [/tex]
[tex]a = 2 \frac{1}{4} + 1 \frac{1}{2} = 2 \frac{1}{4} + 1 \frac{2}{4} = 3 \frac{3}{4} [/tex]
czyli a= 3 3/4
[tex]12 \div a = \frac{3}{4} [/tex]
[tex]12 \div \frac{3}{4} = 12 \times \frac{4}{3} = 16[/tex]
czyli a =16
