stiind ca a/b=1,25 calculeaza​

[tex] \frac{125}{100} \times \frac{8}{7} = \frac{5}{4} \times \frac{8}{7} = \frac{10}{7} [/tex]

[tex] \frac{5}{4} \times ( - \frac{1}{5} ) = - \frac{1}{4} [/tex]

[tex]( - 5 \times a) \times \frac{2}{b } = - 10 \times \frac{a}{b} = - 10 \times \frac{5}{4} = - \frac{25}{2} [/tex]

[tex] \frac{a}{5} \times ( - \frac{4}{b} ) = - \frac{4}{5} \times \frac{a}{b} = - \frac{4}{5} \times \frac{5}{4} = - 1[/tex]

Răspuns:

a/b= 1,25

a/b=125/100

a/b= 5/4

4a= 5b

a= (5b)/4

a)

a/b:7/8=

a/b×8/7=

5/4×8/7=

10/7

b)

a/b:(-5)=

5/4 ×(-1/5)=

-1/4

c)

(-5×a): b/2=

(-5×(5b/4))×2/b=

(-25b)/4×2/b=

(-50b)/4b=

- 25/2

d)

a/5:(-b/4)=

a/5×(-4/b)=

-4a/ 5b=

(-4)(5b/4) / 5b=

-5b/5b=

-1

Explicație pas cu pas: