Пошаговое объяснение:
1) 3/8*(-4)+5=3,5;
1. 3/8*(-4)= -3/2=-1,5
2. -1,5+5=3,5
2)5/9:(-1/3)-7=-8 2/3;
1. 5/9:(-1/3)=5/9*(-3/1)=-5/3=-1 2/3
2. -1 2/3-7=-8 2/3
3) 2/5*(-3)-4/5=-2;
1. 2/5*(-3)=-6/5
2. -6/5-4/5=-10/5=-2
4) 5/12:1/4 -(-1/3)=2;
1. 5/12:1/4=5/12*4/1=5/3
2. 5/3-(-1/3)= 5/3+1/3=6/3=2
5) (1/2)*(-4)-5=-7;
1. 1/2*(-4)=-4/2=-2
2. -2-5=-7
6) 4/9:(-2/3)+1=-1/3
1. 4/9:(-2/3)=4/9*(-3/2)=-2/3
2. -2/3+1=-2/3+3/3=-1/3
Пошаговое объяснение:
1) 3/8*(-4)+5=3,5;
1. 3/8*(-4)= -3/2=-1,5
2. -1,5+5=3,5
2)5/9:(-1/3)-7=-8 2/3;
1. 5/9:(-1/3)=5/9*(-3/1)=-5/3=-1 2/3
2. -1 2/3-7=-8 2/3
3) 2/5*(-3)-4/5=-2;
1. 2/5*(-3)=-6/5
2. -6/5-4/5=-10/5=-2
4) 5/12:1/4 -(-1/3)=2;
1. 5/12:1/4=5/12*4/1=5/3
2. 5/3-(-1/3)= 5/3+1/3=6/3=2
5) (1/2)*(-4)-5=-7;
1. 1/2*(-4)=-4/2=-2
2. -2-5=-7
6) 4/9:(-2/3)+1=-1/3
1. 4/9:(-2/3)=4/9*(-3/2)=-2/3
2. -2/3+1=-2/3+3/3=-1/3