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2014-10-20T15:38:10+03:00
A) 3²+3⁴=9+81=90

b) 3¹+3²+3³+3⁴=3+9+27+81=121

c)
2²+5³=4+125=129
2³+2⁵+2⁶+5²=8+32+64+25=129
2²+2³+2⁴+2⁵+2⁶+5¹=4+8+16+32+64+5=129
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