Question

punctul a,b,c,b va rog ​

Answer 1

Explicație pas cu pas:

10.a)9²⁰÷(3³×3³⁴)×(3²+3×25)÷42=

=(3²)²⁰÷3³⁷×(9+75)÷42=

=3⁴⁰÷3³⁷×84÷42=

=3³×84÷42=

=27×84÷42=

=2268÷42=

=54

b)23,69÷[2+0,9×(25-0,9)]=

=23,69÷(2+0,9×24,1)=

=23,69÷(2+21,69)=

=23,69÷23,69=

=0

c)[(108÷32×2-22)×33-42]÷40=

=[(3,375×2-22)×33-42]÷40=

=[(6,75-22)×33-42]÷40=

=(-15,25×33-42)÷40=

=(-503,25-42)÷40=

=-545,25÷40=

=13,63125

d)216×753-753×196+20×247=

=162648-147588+4940=

=15060+4940=

=20000