Question

Ajutati-ma la 7 si 8 va roggg

Answer 1

Ex.7
a. (-1/2)-(-1/3)+((-1/6)+(+1/12)) = -1/2+1/3+(-1/6+1/12) = -1/2+1/3+(-2+1/12) = -1/2+1/3-1/12 = -6+4-1/12 = -1/4

b. (-1/6)-(-15/8)-(-31/48)-(-13/12) = -1/6+15/18+31/48+13/12 = -8+90+31+52/48 = 165/48 = 55/16
c. (-7/9)-(-2/5)-(-1/15)-2/45 = -7/9+2/5+1/15-2/45 = -35+18+3-2/45 = -16/45
d. (-8/9)-((-5/72)-(-1/12)+(-11/36)) = -8/9-(-5/72+1/12-11/36) = -8/9-(-5+6-22/72) = -8/9-(-21/72) = -8/9-(-7/24) = -8/9+7/24 =-64+21/72 = -43/72
Ex.8

a. 2 1/2-(+5/4)-1,(5) = 5/2-5/4-14/9 = 90-45-56/36 = -11/36
Restul sunt simple!