Question

E urgent va rog din suflet!! DAU COROANA!!!!!!
Calculati produsul A·B si raportul $\frac{B}{A}$ , unde:
a) A=$\sqrt{196}$·($\sqrt{98}$-$\sqrt{18}$+$\sqrt{162}$-$\sqrt{72}$)
B=$\sqrt{162}$·($\sqrt{343}-$-$\sqrt{175}$+$\sqrt{448}$-$\sqrt{63}$

Answer 1

√196=14
√98=7√2
√18=3√2
√162=9√2
√72=6√2
A=14·(7√2-3√2+9√2-6√2)
A=14·7√2=98√2

√343=7√7
√175=5√7
√448=8√7
√63=3√7
B=9√2·(7√7-5√7+8√7-3√7)
B=9√2·7√7=63√14

A·B=98√2·63√14=12348√7
B/A=63√14/98√2=63√7/98