Question

помогите плиз по действиям​

Answer 1

1) -8/25×15/14-11/48/(-7/8)=-127/210

1. -8/25×15/14=-4×3/5×7=-12/35

2.11/48/(-7/8)=11/48×(-8/7)=-11×1/6×7=-11/42

3.-12/35-(-11/42)=-12/35+11/42=(-12/35)×6+(11/42)×5=-(12×6+11×5)/210=-127/210

2)8/15×(-1/2)-3/10/(-6/5)=-3/4

1. 8/15×(-1/2)=-4×1/15×1=-4/15

2. 3/10/(-6/5)=3/10×(-5/6)=-1×1/2×2=-1/4

3.-4/15-(-1/4)=-4/15+1/4=(-4/15×4)+(1/4×15)=-60+15/60=-45/60=-3/4

3)

а) х×2/5=-3/8

х=-3/8/2/5

х=-3/8×5/2

х=-3×5/8×2

х=-15/16

б) х/1/4=-3/15

х=-3/15×1/4

х=-1/5×1/4

х=-1×1/5×4

х=-1/20