1. 12•1+2•{4•3+2•[154-25•(2•4-2)]}=12+2•{12+2•[154-25•(8-2)]}=12+2•{12+2•[154-25•6]}=12+2•{12+2•[154-150]}=12+2•{12+2•4}=12+2•{12+8}=12+2•20=12+40=52
2.36^56=(2^2)^56•(3^2)^56=2^102•3^102
216^37=(2^3)^37•(3^3)^37=2^111•3^111
(2^102•3^102)<(2^111•3^111)
3. 2998(127-126-1)=2998•0=0
4.×= nr.necunoscut
×:95=14 r10
×=95•14+10= 1330+10=1340
5.a•b-a•c=a(b-c)=19•87=1653
6.iepurii au 4 picioare
gainile au 2 picioare
×=nr de gaini
y= nr de iepuri
x+y=13
y=13-×
4y+2×=62
4(13-×)+2×=62
52-4×+2×=62
-2×=10
×=-5
y=18
ceva e aici gresit...
7.c=caiete
s= stilouri
8c+3s=69
2c+4s=66=>2(c+2s)=66=>c+2s=33=>c=33-2s
8(33-2s)+3s=69
264-16s+3s=69
-13s=69-264=-195
s=15
c=33-2s=33-2•15=33-30=3