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10 - ( 6 + 8 ) = 10 - 14 = -4
10 - 5 x 6 = 10 - 30 = -20
( 10 - 5 ) x 6 = 5 x 6 = 30
8 x 7 - 6 = 56 - 6 = 50
8 x ( 7 - 6 ) = 8 x 1 = 8
Mam nadzieję że chociaż trochę pomogłam.