Răspuns:
/-supra
Explicație pas cu pas:
a) 3×5/9-14/2×5/28=
15/9-7×5/28
5/3-35/28
=5/3-5/4
=5/12
b)-1/2×[-4/5+3/4:(-9/8)]
-1/2×[(-4/5+3/4×(-9/8)]
-1/2×(-4/5-3/4×8/9)
-1/2×(-4/5-2/3)
-1/2×(-22/15)
11/15
c) - 8:(3/2×1/4-5/4×16/15)
-8:(3/8-5×4/15)
-8:(3/8-4/3)
-8:(-23/24)
8×24/23
192/23
d) 7/4×1/15+(-1/15)
7/60-1/15
1/20
e) - (-9/2)-4(-5/4+1/4×13/10×20/39)
9/2-4(-5/4+1/10×5/3)
9/2-4(-5/4+1/2×1/3)
9/2-4(-5/4+1/6)
9/2-4×(-13/12)
9/2+13/3
53/6
