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1.Calculati metoda mersului invers
9 x {720 + [ 3 x (9 072 : 27 - a) - 2 400: 6 ] - 78 }=36 900

Răspuns :

Marius76
9×{720+[3×(9072:27-a)-2400:6]-78}=36900
720+[3×(336-a)-400]-78=36900:9
720+[3×(336-a)-400]-78=4100
[3×(336-a)-400]-78=4100-720
[3×(336-a)-400]-78=3380
3×(336-a)-400=3380+78
3×(336-a)-400=3458
3×(336-a)=3458+400
3×(336-a)=3858
336-a=3858:3
336-a=1286
a=336-1286
a= -950

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