1. a)1230
b) 7018
c)2000
d)555
e)304
f)9909
●9909; 7018; 2000; 1230; 555; 304.
●nr impare sunt: 555, 9909.
●1230-1000
2. 3488+2096=5584
7000-3777=3223
59×24=1416
100:10=10
3. a+450:5=10×17
a+90=170
a=170-90
a=80
87:3+b=6×29
29+b=174
b=174-29
b=145
4. 27+(90×8-10×70):10-1=
27+(720-700):10-1=
27+20:10-1=
27+2-1=
27+1=
28
P=28
P= 4×l
4×l=26
l=28:4
l=7cm= 0,7mm
