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3 X {10-2 X[40-2 X(28-3 X5)]}-7X=
VA ROG URGENT


Răspuns :

3*(10-2*(40-2*(28-3*5)))-7x=51
3*(10-2*(40-2*(28-15)))-7x=51
3*(10-2*(40-2*13))-7x=51
3*(10-2*(40-26))-7x=51
3*(10-2*14)-7x=51
3*(10-28)-7x=51
3*(-18)-7x=51
-54-7x=51
-54-51=7x
-105=7x
x=-105/7
x=-15
3 × {10-2 ×[40-2 ×(28-3 ×5)]}-7x=51
3 × {10-2 ×[40-2 ×(28-15)]}=51+7x
3 × [10-2 ×(40-2 ×13)]=51+7x
3 × [10-2 ×(40-26)]=51+7x
3 ×(10-2 ×14)=51+7x
3 ×(-18)=51+7x
-54=51+7z
7x=-105
x=-15