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2. = -45+6= -39
3. = 200+3,75=203,75
4. = 7-40+3=30
5. =1,7+0,5=2,2
6. =2,35*14+ 3,6= 32,9+3,6=36,5
7. =0,9 + (0,5+ 0,8) :1,8= 0,9+1,3:1,8=9/10+13/18=73/45
8. =(7,5-2,75): (1-4/9)= 5,25: 5/9=9,45
9. =(1,8+0,5*8)*(2-1,2)=(1,8+4)*(0,8)=5,8*0,8=4,64
2.=-45+6=39
3.=200+3,75=203,75
4.=7-40+3=30
5.=2,2
6.=36,6
7=11,2
8.=8,55
9=4,64
28-(-3 2/14) =
28 + 3 1/7 =
31 1/7
2. - (-15) × (-3) + (-72) : (-12) =
-45+6=
-39
3. (-25) × (-8) -15 : (-4) =
200-60=
140
4. 7 + 4 ×(-10) - (2-5)=
7+(-40)-(-3)=
7-40+3=
-30
5. 3/5 + 1,1 + (0,9 - 2/5)=
0,6 + 1,1 + (0,9 - 0,4)=
1,7+0,5=
2,2
6. (3,6 - 1 1/4) ×14 + 13 1/5 : 3 2/3=
(3,6-1,25)*14+ 66/5 * 3/11=
2,35*14+ 6/5*3/1=
32,9 + 18/5=
32,9 + 3,6 =
36,5
7. 4/5 + (1,2 × 5/12 + 0,8) : 1/8=
4/5+(12/10*5/12+0,8):1/8=
4/5+(1/2*1/1+0,8):1/8=
4/5+1,3:0,125=
0,8+1300:125=
0,8+10,4=
11,2
8. (4,5 × 1 2/3 - 2,75) : (1- 10/27 : 5/6)=
(9/2*5/3 - 2 3/4):(1-10/27*6/5)=
(3/2*5/1 - 2 3/4):(1-2/9*2/1)=
(15/2 - 2 3/4):(1-4/9)=
(7,5-2,75):(-5/9)=
(4,75):(-5/9)=
-(4 3/4 : 5/9)=
-(19/4 * 9/5)=
-171/20 =
-6 11/20
9. [4,8 : 2 2/3 + 0,5 × (3,6 + 4 2/5) ] × (2-3,2 × 3/8)=
[24/5 : 8/3 + 1/2*8]*(2-16/5*3/8)=
[24/5*3/8 + 4]*(2-2/15)=
[3/5*3/1 + 4]*(1 13/15)=
[9/5 + 4]*28/15=
29/5*28/15=
812/75=
10 62/75