Question

Efectuati in 2 moduri:
a) 5*2 1 supra 3
b)7*3 1 supra 4
c)8 1 supra 3 *5
d)3 3 supra 4 *3
e)4 1 supra 5 *3
f)2 1supra 7 *6
g)5 2 supra 5 *4
h)3 supra 2 *5

Va rog mult ajutati-ma!!!dau coroana!!Imi trebuie pentru maine!!

Answer 1

a) 5×21/3=105/3
5×(10/3+11/3)=5×21/3=105/3
b) 7×31/4=217/4
7×(15/4+16/4)=7×31/4=217/4
c) 81/3×5=405/3
81/3×5=9×9/3×5=81/3×5=405/3
d) 33/4×3=99/4
33/4×3=11×3/4×3=33/4×3=99/4
e) 41/5×3=123/5
41/5×3=(5×8/5+1/5)×3=(40/5+1/5)×3=41/5×3=
123/5
f)21/7×6=3×6=18
21/7×6=(7×3/7)×6=21/7×6=3×6=18
g)52/5×4=208/5
52/5×4=(26×2/5)×4=52/5×4=208/5
h) 3/2×5=15/2
3/2×5=(1+2)/2×5=3/2×5=15/2