Răspuns :
a) x + 6 • 7 = 100
x = 100 - 42
x = 58
b) x - 8 • 9 = 32
x = 32 + 72
x = 104
x = 100 - 42
x = 58
b) x - 8 • 9 = 32
x = 32 + 72
x = 104
[tex]\it a+6\times 7=100 \Rightarrow a+42=100 \Rightarrow a=100-42=58\\ \\ \\ b-8\times9=32 \Rightarrow b-72=32 \Rightarrow b=32+72 \Rightarrow b=104[/tex]