A) -0.69+(-31)-5.3=-(0.69+31+5.3)=-36.99 Б) (7.8)+(-8.7)+(5.9)+(-1.3)=7.8+5.9-(8.7+1.3)=13.7-10=3.7 В) (-5)+(-2.4)+(+1.9)=-7.4+1.9=-(7.4-1.9)=-5.5 Г)(+1,4)+(-7.6)+(-1.8)+(+8)=+9.4-9.4=0
там же надо без скобок5
A) -0.69+(-31)-5.3=-36.99 Б) (7.8)+(-8.7)+(5.9)+(-1.3)=7.8+5.9-(8.=13.7-10=3.7 В) (-5)+(-2.4)+(+1.9)=-7.4+1.9=-(7.4-1.9)=-5.5 Г)(+1,4)+(-7.6)+(-1.8)+(+8)=+9.4-9.4=0