(3*4)+(5*3)+(13*3)+(2*5)=12+ 15+39+10=27+49=76
0,6*6=3,6г
0,8*8=6,4г
3,6+6,4=10г
6+8=14
10/14=0,7143=71,43%
-0.2*(-5)*13 = 1*13 = 13
-2.5*(-1.3)*4 = -2.5*4*(-1.3) = -1*(-1.3) = -1.3
-0.25*(-0.3)*(-4) = -0.25*(-4)*(-0.3) = 1*(-0.3) = -0.3
-4*(-(7/10))*5 = -20*(-(7/10)) = 7*2 = 14
-(8/15)*(-(1/2))*(-(3/4)) = -(8/15)*(3/8) = -1/5 = -0.2
-(3/4)*(-5)*4 = -3*(-5) = 15