Question

120 - 0,5 * 40 * 5 *  0,2 * 20 * 0,25  - 20   /   1+5+9+......+33+37

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Answer 1

\(=\frac{120-0,5\cdot40\cdot5\cdot0,2\cdot20\cdot0,25-20}{1+5+9+.....+33+37}\)

\(=\frac{120-20-\left(0,5\cdot20\right)\cdot\left(5\cdot0,2\right)\cdot\left(40\cdot0,25\right)}{1+5+9+.....+33+37}\)

\(=\frac{100-10\cdot1\cdot10}{1+5+9+.....+33+37}\)

\(=\frac{100-100}{1+5+9+.....+33+37}\)

\(=\frac{0}{1+5+9+.....+33+37}\)

\(=0\)

Answer 2

Ta có:\(120-0,5\times40\times5\times0,2\times20\times0,25-20=120-100-20=0\)

\(\Rightarrow\frac{120-0,5\times40\times5\times0,2\times20\times0,25}{1+5+.......+37}=\frac{0}{1+5+9+.....+37}=0\)

Vậy...........

Answer 3

thanks