Question

oblicz:

1.

(1,2:3/5-1.1/3*0,3):1.1/7=

2.

3.3/4*1 2/10+1,5:2.2/5-1/8=

3.

4/5+(1,2*5/12+0,8):1/8=

4.

0,2+3/5=

5.

1.1/3-0,1=

6.

1,25*3/4=

7.

0,7:7/9=

Answer 1

1.

(1,2:3/5-1.1/3*0,3):1.1/7= ( 1 2/10 * 5/3 - 1 1/3 * 0,3) : 8/7 = (12/10 * 5/3 - 4/3 * 3/10) * 7/8 =                (60/30-12/30) * 7/8 = (2 - 2/5) * 7/8 = 1 3/5 * 7/8 = 8/5 * 7/8 = 56/40 = 1 16/40 = 1 4/10 = 1 2/5

2.

3.3/4*1 2/10+1,5:2.2/5-1/8= 15/4 * 1 1/5 + 1 1/2 : 12/5 - 1/8 = 15/4 * 6/5 + 3/2 * 5/12 - 1/8 = 90/20 + 15/24 - 1/8 = 9/2 + 15/24 - 1/8 = 108/24 + 15/24 - 3/24 = 123/24 - 3/24 = 120/24 = 5

3.

4/5+(1,2*5/12+0,8):1/8= 4/5 + ( 1 2/10 * 5/12 + 8/10) * 8/1 = 4/5 + (1 1/5 * 5/12 + 4/5) * 8/1 = 4/5 + (6/5 * 5/12 + 4/5) * 8/1 = 4/5 + (30/60 + 4/5) * 8/1 = 4/5 + (1/2 + 4/5) * 8/1 = 4/5 + (5/10+ 8/10) * 8/1 = 8/10+13/10 * 8/1 = 21/10 * 8/1 = 168/10 = 16 8/10 = 16 4/5

4.

0,2+3/5= 2/10 + 3/5 = 1/5 + 3/5 = 4/5

5.

1.1/3-0,1= 4/3 - 1/10 = 40/30 - 3/30 = 37/30 = 3 7/30

6.

1,25*3/4= 1 1/4 * 3/4 = 5/4 * 3/4 = 15/16

7.

0,7:7/9= 7/10 * 9/7 = 63/70