Question

Urgenttt vă rog frumos

Answer 1

1.a)9+7-3-8=16-3-8=13-8=5
b)5+9-8+18+12+5=16-8+18+12+5=8+18+12+5+8=26+12+5+8=46+5=51

2.a)3,4+6,9-5,3+9,8=9,13-5,3+9,8=4,10+9,8=13,18
b)1/2+2/3-2/3-3/4= aducem termenii la acelasi numitor
=2*(1/2)+2/3-2/3-3/4=
=3*(2/4)+4*(2/3)-4*(2/3)-3*(3/4)=
=6/12+8/12-8/12-6/12=
=12/12-8/12-6/12=
=4/12-6/12=
=-2/12=-1/6

2*(1/2)=2*(x)=amplificare