Question

Am nevoie pe maine!!!!! Urgenttttt

Answer 1

1)a)
2+[2+3x(4+2x25x4)]=
=2+[2+3x(4+50x4)]
=2+[2+3x(4+200)]
=2+(2+3x204)
=2+(2+612)
=2+614
=616

B)
2x{3+10x[32+(24:4)]}
=2x[3+10x(32+6)]
=2x(3+10x38)
=2x(3+380)
=2x383
=766


2)a)
74+{54:2+[(32:2+4)-20]}-1=100
74+{27+[(16+4)-20]}-1=100
74+[27+(20-20)]-1=100
74+(27+0)-1=100
74+27-1=100
101-1=100
100=100 adevărat

B)
5+10x{1x1+[(640:4-60)-100]}=15
5+10x{1+[(160-60)-100]}=15
5+10x[1+(100-100)]=15
5+10x(1+0)=15
5+10x1=15
5+10=15
15=15 adevărat


3)
A+(1000-800 +8):2=233
A+(200+8):2=233
A+208:2=233
A+104=233
A=233-104
A=129



4)notam a necunoscuta
Dublul lui a=2a
(2a-5)x100=700
2a-5=700:100
2a-5=7
2a=7+5
2a=12
A=12:2
A=6
Verificare
2x6-5=12-5=7
7x100=700 adevărat


5)notam a-peri, b-pruni si c-caisi
A+b+c=284
A=284:2
A=142 peri
B=284:4
B=71 pruni
142+71=213 peri si pruni
A) c=284-213
C=71 caisi

B) (284:2)+(284:4)+c=284
142+71+c=284
213+c=284
C=284-213
C=71

142+71+71=284
213+71=284
284=284