[tex]\displaystyle\bf\\b_{1} =7\\\\b_{4} =56\\\\b_{4} =b_{1} \cdot q^{3} \\\\q^{3} =b_{4} :b_{1} =56:7=8\\\\q=\sqrt[3]{8} =2\\\\b_{2} =b_{1} \cdot q=7\cdot 2=14\\\\b_{3} =b_{2} \cdot q=14\cdot 2=28\\\\Otvet:7 \ \ ; \ \boxed{ \ 14 \ \ ; \ \ 28 \ } \ ; \ \ 56[/tex]
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[tex]\displaystyle\bf\\b_{1} =7\\\\b_{4} =56\\\\b_{4} =b_{1} \cdot q^{3} \\\\q^{3} =b_{4} :b_{1} =56:7=8\\\\q=\sqrt[3]{8} =2\\\\b_{2} =b_{1} \cdot q=7\cdot 2=14\\\\b_{3} =b_{2} \cdot q=14\cdot 2=28\\\\Otvet:7 \ \ ; \ \boxed{ \ 14 \ \ ; \ \ 28 \ } \ ; \ \ 56[/tex]