Question

Fie proportia a supra 16-1/8÷0,05=4/b. a)Rezultatul calculului 16-1/8:0,05 este egal cu .......
b)Produsul dintre nr a si b este egal cu ......
c) Daca a=18,atunci b este egal cu ........
Va rog!!!!Am nevoie repede de acest exercitiu!!​

Answer 1

Răspuns:

$\bf a)\; \boxed{\bf \dfrac{27}{2} }$

$\bf b)\;\; \boxed{\bf\;\; a\cdot b =54\;\;}$

$\bf c)\;\; \boxed{\bf b=3}$

Explicație pas cu pas:

$\bf \;$

$\bf \dfrac{a}{16-\dfrac{1}{8};0,05 } = \dfrac{4}{b} \iff \dfrac{a}{16-\dfrac{1}{8}:\dfrac{5}{100}^{(5} } = \dfrac{4}{b}$

$\bf \;$

$\bf \dfrac{a}{16-\dfrac{1}{8}:\dfrac{5}{100}^{(5} } = \dfrac{4}{b} \iff \dfrac{a}{16-\dfrac{1}{8}:\dfrac{1}{20} } = \dfrac{4}{b}$

$\bf \;$

$\bf \dfrac{a}{16-\dfrac{1}{8} \cdot \dfrac{20}{1}} = \dfrac{4}{b} \iff \dfrac{a}{16-\dfrac{20 }{8}^{(4} } = \dfrac{4}{b}$

$\bf \;$

$\bf \dfrac{a}{16-\dfrac{5}{2} } = \dfrac{4}{b} \iff \dfrac{a}{\dfrac{32}{2} - \dfrac{5}{2} } = \dfrac{4}{b}$

$\bf \;$

$\bf \dfrac{a}{ \dfrac{27}{2} } = \dfrac{4}{b} \iff a:\dfrac{27}{2} = \dfrac{4}{b} \iff a \cdot \dfrac{2}{27} = \dfrac{4}{b}$

$\bf \;$

$\bf \dfrac{2a}{27} = \dfrac{4}{b} \implies 2ab=4 \cdot 27 \iff a\cdot b = \dfrac{27 \cdot 4}{2} = \boxed{\bf 54}\;\; (b)$

$\bf \;$

$\bf c)\; a=18 \implies a\cdot b = 54 \;\; \Bigg|\;\; b = \dfrac{54}{18} = \boxed{\bf 3}$

$\bf \;$

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