Решить вообще непонятно: 0.32*0.12+0.068*0.33-0.12*0.87+0.33*0.074=

0.32*0.12 + 0.068*0.33 - 0.12*0.87 + 0.33*0.074 =
=(0.32 * 0.12 - 0.12 * 0.87) + (0.068 * 0.33 + 0.33 * 0.074) = 
= 0.12(0.32 - 0.87) + 0.33(0.068 + 0.074) =
= 0.12 * (-0.55) + 0.33 * 0.142 = 
= -0.066 + 0.4686 = -0.0914

1) 0.12*(0.32-0.87)=0.12*(-0.55)=-0.066
2) 0.33*(0.068+0.074)=0.33*0.142=0.04686
3) 0.04686-0.066=-0.01914