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80-(30+10-x)=60 x-(540-420)=70

Răspuns :

Renatemambouko
80-(30+10-x)=60
80-40+x=60
40+x=60
x=60-40=20

x-(540-420)=70
x-120=70
x=70+120=190


80-(30+10-x)=60

80-40+x=60

40+x=60

x=60-40=20

x-(540-420)=70

x-120=70

x=70+120=190


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