Question

tema la mate. vă rog ajutați-mă​

Answer 1

20. prima simplificăm fracție prin 14.

$\frac{3}{n} = \frac{14}{42}$

$\frac{3}{n} = \frac{1}{3}$

$\frac{1}{n}$

21.

$\frac{a + 2}{39} = \frac{7}{13}$

$13(a + 2) = 273$

$a + 2 = 21$

$a = 21 - 2$

$a = 19$

17.

12+8=20

P=12/20/0,6

19.

3 supra 6 = 4 supra 8

9.

c=13%

ms=100g

md=?

c/100=md/ms

md=c•ms/100=13•100/100=23g

8.

md=40g

m=200+40=240

c=md/m×100=40/240×100=100/6=16.66%

6.

a=13b/20

b.....100%

13b/20....x

x=13b/20×100/b=65%

2.

a/b=5

a/12,4=5/1

a=5•12,4

a=62

1.

x/y=3/7

y/z=7/12

x/z=?

x=3y/7

z=12y/7

x/z=3y/7/12/7=3y/7•7/12y=

1/4