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[450:5:(3X6)+35]X7-140+(540:60+7)X(63:9)=

Răspuns :

= [90:18+35]x7-140+(9+7)x7=
= [5+35]x7-140+112=
= 40x7-140+112=
= 280-140+112=
= 140+112=
= 252. 
 
cu plăceree ^.^
[450:5:(3×6)+35]×7-140+(540:60+7)×(63:9)= [90:18+35]×7-140+(9+7)×7= [5+34]×7-140+16×7= 39×7-140+112= 273-140+112= 245