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a fost răspuns

Numaru 7/15×(-5/28)÷8/21

Răspuns :

7/15×(-5/28)÷8/21=
=-1/3*1/4*21/8=
=-1/4*7/8=
=-7/32
7/15×(-5/28)÷8/21- simplificam primele doua fractii
7/15×(-5/28)÷8/21 = (-1/12):8/21 = (-1/12)*21/8=7/32