Question

test de evaluare stadială
calculați​

Answer 1

Explicație pas cu pas:

1.a)1 7/20-⁴3/5=27/20-12/20=15/20=3/4

b)11/14-1 3/4=²11/14-⁷7/4=22/28-49/28=

-27/28

c)(-2/9)-(2 5/6)=²(-2/9)-³17/6=-4/18-51/18=

-55/18

2.a)2,70-1,(18)=2,70-1 18/99=2,70-117/99=

270/100-13/11=¹¹27/10-¹⁰13/11=

297/110-130/110=167/110=1,5(18)

b)2,(3)-1,16=2 3/9-116/100=

21/9-116/100=7/3-58/50=²⁵7/3-³29/25=

(175-87)/75=88/75=1,17(3)

c)-1,2(7)-3,5=1 (27-2)/90-35/10=

1 25/90-7/2=15/18-⁹7/2=(15-63)/18=

48/18=24/9

3.a=1 4/5-2,0(6)-2 1/3=9/5-2 6/90-7/3=

9/5-186/90-7/3=³9/5-31/15-⁵7/3=

(27-31-35)/15=(27-66)/15=-39/15=-13/5

opusul lui -13/5 este +13/5