Question

dau coroană, până mâine ​

Answer 1

1. 234-145=89

2. 11101=1*$10^{4}$+1*$10^{3}$+1*$10^{2}$+0*$10^{1}$+1*$10^{0}$

3. 2*13=26, 2+13=15

4. multiplii lui 7 cuprinsi intre:20 si 63=21,28,35,42,49 si 53, 6 numere in total

5. a*c-b*c=? c=4, a-b=11

c*(a-b)=4*11=44

6. 25 este patratul perfect lui 5

7.  A=10^2017+2x10^2016+1

A=10...0(de2017ori)+2*10...0(de2016ori)+1

A=10...0(de2017ori)+20...0(de2016ori)+1

A=120...0(de2016ori)+1

A=120...01( 0 de 2015 ori)

Suma cifrelor lui A=SA

SA=1+2+0+0+...+0+1

SA=1+2+0*2015+1

SA=3+0+1

SA=4

8. 44x+4x4+x44=1221

400+40+X+400+10X+4+100X+40+4

888+111x=1221

111x=1221-888

111x=333

x=333:111

x=3

9.

$2^{7}*3^{8}+2^{9}* 3^{7}+2^{7}*3^{8} \\a=2^{7} *3^{7} (3+2^{2} +3)\\a=(2*3)^{7} *(6+4)\\a=6^{7} *10$

a divizibil cu 5

10. x:y=3rest19

x=3y+19

a) 2*(3y+19)-6y+3=

6y+38-6y+3=41

b) 3y+19+y>95

4y>95-19

4y>76

y>76:4

y>19

4*19=76, nu este mai m are decat 95, relatia este falsa

c) 3y+19-y<61

2y+19<19

2y<0

y<0

0<61, relatia este adevarata

11. B-baieti

F-fete

B=2F

B-4=3(F-4)

2F-4=3F-12

3F-2F=12-4

F=8

B=16