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Binciuionutcristian
a fost răspuns

Rezolvati in multimea numerelor naturale ecuatiile: a) 2x+7=43+x, b) 84:(x-3)=12 , c)3X(4+5x)=72

Răspuns :

Gandac
a)
2X+7=43+X
2X-X=43-7
X=36
verificare
2×36+7=43+36
72+7=79
79=79
b)
84÷(X-3)=12
84=12(X-3)
84=12X-36
84+36=12X
120=12X
X=120÷12
X=10
verificare
84÷(10-3)=12
84÷7=12
c)
3×(4+5X)=72
12+15X=72
15X=72-12
15X=60
X=60÷15
X=4
verificare
3×(4+5×4)=72
3×(4+20)=72
3×24=72

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