Răspuns :
Răspuns
6
Explicație pas cu pas:
456-(190×28-263×19)-7×a=9×10+1
456 - (5320 - 4997)-7×a = 90+1
456 - 323 - 7×a =91
133 - 7×a=91
7×a=133-91
7×a=42
a=42:7
a=6
456 - ( 190 × 28 - 263 × 19 ) - 7 × a = 9 × 10 + 1
456 - ( 5320 - 4997 ) - 7 × a = 90 + 1
456 - 323 - 7 × a = 91
133 - 7 × a = 91
7 × a = 133 - 91
7 × a = 42
a = 42 : 7
a = 6
456 - ( 5320 - 4997 ) - 7 × a = 90 + 1
456 - 323 - 7 × a = 91
133 - 7 × a = 91
7 × a = 133 - 91
7 × a = 42
a = 42 : 7
a = 6