## Problem 1

Perform the calculations:

a) $7 \cdot 147 - 7 \cdot 47$ (1p)

b) $(2+4+6+8+\cdots+50)-(1+3+5+7+\cdots+49)$ (2p)

c) $10 \cdot 9^{2} : 3^{2} - 3^{4} \quad(2 \text{p})$

d) $(\overline{a b} + \overline{b c} + \overline{c a}) : (a + b + c) \quad$ (2p)
## Problem 1

a) 7400 ..................................................................................................................... 1p

![](https://cdn.mathpix.com/cropped/2024_06_07_dfc9162f0525ae4a7f10g-2.jpg?height=68&width=1493&top_left_y=920&top_left_x=262)

c) \(10 \cdot(9: 3)^{2}-3^{4}=\)..................................................................................... 1p

![](https://cdn.mathpix.com/cropped/2024_06_07_dfc9162f0525ae4a7f10g-2.jpg?height=65&width=1434&top_left_y=1065&top_left_x=324)

![](https://cdn.mathpix.com/cropped/2024_06_07_dfc9162f0525ae4a7f10g-2.jpg?height=71&width=1480&top_left_y=1141&top_left_x=274)

= 11 ...................................................................................................................... 1p