Question

matematica clasa a 6a , urgent !! dau coroana!​

Answer 1

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