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25+14x17:2
=(14+25)17 /2
=39 x 17 /2
=663/2
=331,5
b)L trapesium=(a+b)t /2
=(12+32)15 /2
=44 x 15 /2
=550
5. a)L trapesium=(a+b)t /2
=(8+16)15 /2
=24x15 /2
=180
b)L trapesium=(a+b)t /2
=(7+10)13 /2
=17x13 /2
=221/2
=110,5