Question

prosze o dobre rozwiązanie tych zadań bo ilość punktów jest duża

Answer 1

1.

1 3/7 + 2 6/7 = 3 9/7 = 4 i 2/7

1/2 + 2/3 + 3/4 = 6/12 + 8/12 + 9/12 = 23/12 = 1 i 11/12

2 3/4 -1 2/3 = 2 9/12 - 1 8/12 = 1 i 1/12

8 1/2 - 6 5/7 = 7 21/14 - 6 10/14 = 1 i 11/14

3/8 * 5/6 = 5/16

4 2/9 * 6 = 38/9 * 6 = 76/3 = 25 i 1/3

2/3 * 5/12 = 2/3 * 12/5 = 8/5 = 1 i 3/5

3 5/7 : 3 1/4 = 26/7 : 13/4 = 26/7 * 4/13 = 4/7

3.25 + 12,4 = 15,65

1,05:2,1 = 105:210 = 0,5

17-9,3 = 7,7

57*2,3 = 131

0,257 : 100 = 257:100000 = 0,0025

17-(-20) = 17+20 = 37

-8-(-12) = -8+12 = 4

7+(-2) = 7-2 = 5

36:(-4) = -9

6,5 : (-13 = 65:(-130) = -0,5

(-5 1/3):(-8/11) = (-16/3)*(-11/8) = 22/3 = 7 i 1/3

(-5/8) *1,6 = (-5/8)* 16/10 = (-5/8) * 8/5 = -1

(-7)*(-8) = 56

20-6*3+4 = 20-188+4 = 6

18:6+7*3 = 3+21 = 24

-3-2*(-7) = -3+14 = 11

12*(-3)-(-4)*12 = -36+48 = 12 

2.

3/100 *100% = 3%

0,4 *100% = 40%

2,3 *100% = 230%

6/25 *100% = 24%

3.

25% = 25/100 = 1/4 = 0,25

87% = 87/100 = 0,87

130% = 130/100 = 1,3

0,8% = 8/10 :100 = 0,008

3/4% = 0,75:100 = 0,0075

17/20% = 17/20 :100 = 0,0085

4.

22% *200zł = 0,22 *200zł = 44zł

25% *80dag = 0,25*80dag = 20 dag

12% *20l = 0,12 *20l = 2,4 l

5.

a+b,  dla   a = 8,  b = -8

8+(-8) = 8-8 = 0

 

a:b,   dla   a = 3 1/9,  b = 4 2/3

3 1/9 : 4 2/3 = 28/9 : 14/3 = 28/9 * 3/14 = 2/3 

 

5x*y,  dla   x = -0,5,  y = -3

5*(-0,5)*(-3) = (-2,5)*(-3) = 7,5

 

6.

-2a+b-a-2b+3a = -b

 

15xy-4x+8y-6xy+5x-xy = 8xy+x+8y

 

0,2x²-2y+1,8x²+4,3y-x = 2x²-x+2,3y

 

7.

5x+(2x-7)-9x-(-3x+8)+20-8x = 5x+2x-7-9x+3x-8+20-8x = -7x+5

 

-5x+(-2y+4x)-(7x-8y)-x+(2-6y) = -5x-2y+4x-7x+8y-x+2-6y = -9x+2 

 

-9z-(4-3z)-8y-(-7z+8y)+(-2y-7) = -9z-4+3z-8y+7z-8y-2y-7 = z-18y-11

 

5(3z-7)-9(-8z-6) = 15z-35+72z+54 = 87+19

 

-2(6+4y)+3y = -12-8y+3y = -12-5y

 

2(x+1)-3(x-1) = 2x+2-3x+3 = -x+5

 

 

 

Answer 2

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