1. a) 0.2+1.5=1.7:2=0.85
b)0.5+10+3.24=13.74:3=4.58
c)3+7+10+12=32:4=8
d)3.2+2+0.4+1.25=6.85:4=1.7125
2. 2.7:3=0.9
3. 0.5x4=2
4. ma= 11.7+22.5+17.3+15.4=66.9:4=16.725
66.9+7.5=74.4:5=14.88
16.725-14.88=1.845
5. 34x2=76 76-49=27
6.a)x=0.2:4+4.5=0.05+4.5=4.55
y=3.8x12.5:3.3=47.5:3.3=14.3939393939
ma=(4.55+14.3939393939):2=18.9439393939:2=9.47196969697
b)x=61.191
y=0.1 la a 2+1.2=1.21
7. Ma = 144 => a + b + c = 144x3 = 432
Ma = 78,5 => a + b = 78,5x2 = 157
c = 432 - 157 = 275
8. 3.2x4=12.8 12.8-3.5=9.3 9.3:3=3.1
9. 102x3=306 1 I-----I
2 I-----I--I }306
3 I-----I--I--I
306-6=300
300:3=100(1)
100+2=102(2)
102+2=104(3)
10. (a+b)/2 = 11 ⇒ a+b = 22
(b+c)/2 = 36 ⇒ b+c = 72
(c+a)/2 = 32 ⇒ c+a = 64
2(a+b+c) = 158 ⇒ a+b+c = 79
22+ c = 79 ⇒ c= 57
b+57= 72 ⇒ b= 15
a+ 15 = 22 ⇒ a= 7
11. a)3.7+0.9+1.123+1.25=6.973:4=1.74325
b)2.2 + 70 + 11.3 + 4.1=87.6
c)3.2 + 4 + 7.5=14.7
Sper ca te-am ajutat!
P.S: ASTEPT COROANA. AM MUNCIT MULT! :D
