Question

1.oblicz
3.2:(0.8-2\5)
4.8+1\3x(1,2-0.6)
(1-7\9)x(5.2-0.7)
123:10+0.2x0.61
(6,5-4.7):(4-2 1\5)
(1.5-1 1\3)x 2 2\5-0.1
(6.25-2 1\2):2 1\7-1
2. oblicz
5x 7+19\10
6x 7-3\3
14-9\9+6x3
21x 1\7+7\7
8\9-4: 16-10\12
(14x 81-17\21); 8\3
3. 2.75 + 0.1 x10\0.25x5
1.4\(2 2\3-1 1\2)x6
2\3+1\2-0.5\o.2-0.8x1\8
Pomoże ktoś?

Answer 1

3.2:(0.8-2/5) = 3,2 : 0,4 = 8
4.8+1/3x(1,2-0.6) = 4,8 + 1/3 * 0,6 = 4,8 + 0,2 = 5
(1-7/9)x(5.2-0.7) = 2/9 * 45/10 = 5/5 = 1
123:10+0.2x0.61 = 12,3 + 0,122 = 12,422
(6,5-4.7):(4-2 1/5) = 1,8 : 1,8 = 1
(1.5-1 1/3)x 2 2/5-0.1 = (15/10 - 4/3) * 2,4-0,1 = (45/30-40/30)*2,3 = 1/6*23/10 = 23/60
(6.25-2 1/2):2 1/7-1 = 3,75 : 15/7-1 = 15/4*7/15 - 1 = 7/4 - 1 = 3/4
2. oblicz
5x 7+19/10 = 35 + 19/10 = 36 9/10 = 36,9
6x 7-3/3 = 35 - 1 = 34
14-9/9+6x3 = 14 - 1 +18 = 31
21x 1/7+7/7 =3 + 1 = 4
8/9-4: 16-10/12 = 8/9 - 1/4 - 5/6 = 32/36 - 9/36 - 30/36 = -7/36
(14x 81-17/21) : 8/3 = (1134 - 17/21) : 8/3 = 23814/21 - 17/21) : 8/3 = 23797/21 * 3/8 = 71391/168 = 424 159/168
3. 2.75 + 0.1 x10/0.25x5 = ????
1,4:(2 2/3-1 1/2)x6 = 1,4 : (2 4/6 - 1 3/6) * 6 = 1,4 : 1 1/6 * 6 = 7/5 * 6/7 * 6 = 36/5 = 7 1/5
2/3+1/2-0.5 : 0.2-0.8x1/8 = 1/3 - 25/10 - 1/10 = 10/30 - 75/30 - 3/30 = -68/30 = - 2 4/15