Question

Se stie ca a×b=17,25 si c=0,2 calculati:
1) a×(b×c);
2)a×b+c;
3)a×b-c.
Calculati numarul de cifre zecimale pentru a si b: a=0,2la putera 100×25puterea50 si b=0,25la puterea25×0,04la puterea25

Answer 1

a×b=17,25 si c=0,2 calculati:
1) a×(b×c)=a×b×c=17,25×0,2=3,45
 2)a×b+c=17,25+0,2=17,45
3)a×b-c=17,25-0,2=17,05


a=0,2¹⁰⁰×25⁵⁰=1/5¹⁰⁰×(5²)⁵⁰=1/5¹⁰⁰×5¹⁰⁰=1         { 0 zecimale}
b=0,25²⁵×0,04²⁵=(0,25×0,04)²⁵=(0,01)²⁵=1/100²⁵=1/10⁵⁰    {50 zecimale}