30/7+17/17-40/7-29/9-46/9+12/9 =7/7-63/9=-6;
-0,7*(-2/9)*45=+7/10*2/9*45= 7/45*45= 7;
-5*(-1,2)*(-7) = - 42,0
30/7+17/17-40/7-29/9-46/9+12/9 =7/7-63/9=-6;
-0,7*(-2/9)*45=+7/10*2/9*45= 7/45*45= 7;
-5*(-1,2)*(-7) = - 42,0