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Dau coroana
Calculati:
a) {[3.5.25-(14+6.4)]-5.43}:2+15=
b) 3.{477:9+2.[10+5.(306:17-288:18)]}-79=
Dau coroana


Răspuns :

a) {[15•25-(14+24)]-215]:2+15= [(345-38)-215]:2+15= (307-215):2+15= 92:2+15= 46+15= 61. b) 3•{53+2•[10+5•(18-16)]}-79= 3•[53+2•(10+10)]-79= 3•(53+2•20)-79= 3•(53+40)-79= 3•73-79= 219-79= 140.