Răspuns :
varianta 1 subiectul III 1.40x75=3000
75+25=100
3000/100=30zile
2.x/1/12=y/1/10=z/1/18=p x+y+z=301
12x=10y=18z=p
x=p/12
y=p/10
z=p/18
p/12+p/10+p/18=301aducem la acelasi numitor
15p/180+18p/18o+10p/180=301
43p/180=301
43p=301x180
43p=54180
p=54180/43
p=126
x=126/12=.>x=1,5
y=126/10=>y=12,6
z= 126/18=>z=7
varianta 2 subIII
1.in cate ore se va
termina lucrarea?
12x18x10=2160 ore
cate ore s-au lucrat pana la venirea celor trei muncitori?
5zilex18muncitorix10ore=900 0re
cate ore mai sunt de lucrat pana la terminarea lucrarii?
2160-900=1260 ore
cate ore mai are de lucrat un muncitor?
1260/15=84 ore
in cate zile se va termina lucrarea de la venirea celor trei muncitori?
84/9=9 rest 3 deci 9 zile si 3 ore
in cate zile se va termina toata lucrarea?
5+9 si3ore=14zile si 3 ore
2.imi pare rau geometrie nu stiu
varianta 3 sub III
1.a.I7X-1I=15
7X+1=15
7X=15-1
7X=14
X=14/7
X=2
b
X/12=0,36/o,72
X=0,36/0,72x12
X=4,32/0,72
X=6
Varianta 4 1.a. (-3+9-7)-(-4-7+5)=(-1)-(-6)= -1+6=5
b.(-64):(-4)-35:(-7)=16--(--5)=16+5=21
c.125:(-5)la 2=125:25=5
2.a/11=b/3
3a=11b
a=11b/3
7x11b/3-2b totul supra3x11b/3+5b=77b/3-2b supra 33b/3+5b =77b/3-6b/3 supra 33b/3+15b/3=71b/3supra48b/3=71b/3x3/48b=71/48
deci 7a-2b/3a+5b=71/48
doar la acestea am stiut imi pare rau
75+25=100
3000/100=30zile
2.x/1/12=y/1/10=z/1/18=p x+y+z=301
12x=10y=18z=p
x=p/12
y=p/10
z=p/18
p/12+p/10+p/18=301aducem la acelasi numitor
15p/180+18p/18o+10p/180=301
43p/180=301
43p=301x180
43p=54180
p=54180/43
p=126
x=126/12=.>x=1,5
y=126/10=>y=12,6
z= 126/18=>z=7
varianta 2 subIII
1.in cate ore se va
termina lucrarea?
12x18x10=2160 ore
cate ore s-au lucrat pana la venirea celor trei muncitori?
5zilex18muncitorix10ore=900 0re
cate ore mai sunt de lucrat pana la terminarea lucrarii?
2160-900=1260 ore
cate ore mai are de lucrat un muncitor?
1260/15=84 ore
in cate zile se va termina lucrarea de la venirea celor trei muncitori?
84/9=9 rest 3 deci 9 zile si 3 ore
in cate zile se va termina toata lucrarea?
5+9 si3ore=14zile si 3 ore
2.imi pare rau geometrie nu stiu
varianta 3 sub III
1.a.I7X-1I=15
7X+1=15
7X=15-1
7X=14
X=14/7
X=2
b
X/12=0,36/o,72
X=0,36/0,72x12
X=4,32/0,72
X=6
Varianta 4 1.a. (-3+9-7)-(-4-7+5)=(-1)-(-6)= -1+6=5
b.(-64):(-4)-35:(-7)=16--(--5)=16+5=21
c.125:(-5)la 2=125:25=5
2.a/11=b/3
3a=11b
a=11b/3
7x11b/3-2b totul supra3x11b/3+5b=77b/3-2b supra 33b/3+5b =77b/3-6b/3 supra 33b/3+15b/3=71b/3supra48b/3=71b/3x3/48b=71/48
deci 7a-2b/3a+5b=71/48
doar la acestea am stiut imi pare rau