Question

ex.10,dau coroana
$( {5}^{2} - {4}^{2} ) \div 9$
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Answer 1

Răspuns:

a) (5²-4²):9=(25-16):9=9:9=1

b) 12×35-12×24+12=420-288+12=144

c) [9²-2⁴×5⁹:(5⁴)²]:2²=(81-2⁴×5):2²=(81-16×5):2²=(81-80):2²=1:2²=1/2²=1/4=0,25