Question

pls toate va rog mult de tot

Answer 1

5. 13/9=1,(4);  137/35=3,0(4)

6. (0,6+1intreg si 7/18)=6/10×(1×18+7)/18=5/6

7. 0,42+0,92-0,52=0,82

8.(35/10:5/10+1,2)×2-1,4=35/10×10/5)×2-14/10=(7+6/5)×2-7/5=[(7×5+6)/5]×2-7/5=(41/5)×2-7/5=75/5=15

9.[(3×2+3×4):(23-20)+4×3+2]×2-25
=(6+12):3+12+2)×2-25
=(6+14)×2-25
=20×2-25=40-25
=15

10. {1+2[3+4(30+7)]}:3-100
=[1+2(3+4×37)]:3-100
=[1+2×(3+141)]:3-100
=(1+2×144):3-100
=281:3-100
=93-100
=-7

11. a+b=565  si b=298+2a
a+298+2a=565
3a=565-296
3a=267
a=89
b=298-2×89
b=476

12.(a+b)/2=15⇒a+b=30  dar a=9 deci b=30-9=21