Question

afla termenul necunoscut .7*4-a=10, a-4*9=93, 8*4-a=15 .7*4-a=60, 7*3-a=3, a-5*4=45

Answer 1

7*4-a=10 a=28-10 a=18; a-4*9=93 a=93-36 a=57; 8*4-a=15 a=32-15=17 7*4-a=60 a=60-28=32 7*3-a=3 a=21-3=18 a-5*4=45 a=45+20=65