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Valoarea lui "a" din propozitia 5 + [200 - 184 + (9:a x 8 + 28:4)]x6 = 287

Răspuns :

5+[200-184+(72/a+7)]X6=287
5+[16+72/a+7]X6=287
5+(23+72/a)X6=287
5+138+432/a=287
143+432/a=287
432/a=287-143
432/a=144
432=144a=>a=432÷144=>a=3
5+[200-184+(9:a x 8+28:4)]x6=287
[200-184+( 9:a x 8+7)]x6=287-5
16+(9:ax8+7)=282:6
16+9:ax8+7=47
9:ax8+7=47-16=31
9:ax8=31-7=24
9:a=24:8=3
a=9:3=3
a=3