Question

am nevoie de acest exercitiu

Answer 1

Explicație pas cu pas:

a) aducem la același numitor

2,4+1/9[-7/10+2(-6/22+11/22)]=2,4+1/9(-7/10+2*5/22)=2,4+1/9(-7/10+5/10)=2,4+1,9*(-2/10)=24/10-2/90=216/90-2/90=214/90=107/45

b)-3/41*(20*2+1)/2-8/3*(1-5/13*13/2)=-3/41*41/2-8/3(1-5/2)= -3/2-8/3(2/2-5/2)= -3/2 -8/3*(-3/2)=-3/2 +8/2=5/2

c) (-9/13)*(-39/99)*(-20/21)= 3/11*(-20/21)=-20/77

d) -4/5(-3/16+2/16)+3/10(2/2-1/2)= -4/5( -1/16)+3/10*1/2=1/20+3/20=4/20=1/5