Răspuns:
Explicație pas cu pas:
a) 300-4•{18+(-3)•[20-5•(25-(-3)³)]-3²}+[(-7)³]⁵÷(-7)¹³
= 300-4•{18+(-3)•[20-5•(25+27)]-9}+ (-7)^15÷(-7)^13
= 300-4•[18+(-3)•(20-5•52)-9]+ 7^2
= 300-4•[18+(-3)•(20-260)-9]+ 49
= 300-4•[18+(-3)•(-240)-9]+ 49
= 300-4•(18+720-9)+ 49
= 300-4•729+ 49
= 300 - 2916 + 49
= -2616 + 49
= -2567
_____________
b)
0,37 + 2/5 = 37/100 + 40/100 = 77/100
77/100 : 11/3 = 77/100 *3/11 = 21/100
2/3 - 1/4 = 8/12 - 3/12 = 5/12
5/12*12/5 = 1
21/100 - 1 = 21/100 - 100/100 = 79/100 = 0,79
