a)
8:(-1 3/5) - (4 ½ x 1 ⅔ - 3 ¾
--------------------------------
½ x 2 ½
b) ½ - 2/5 : ( 1 ⅔ - 2 1/5)
---------------------------
⅔ x 1 ½ - ¾
c)
(⅔ x 2,7 - 7/15 : ⅓) :1/25 x (¾ - 1/6)
------------------------------------------
8/15 + 0,3
d)
(1/15 + 1,3) : 3/2 - ( 18 ¾ - 4,95) : 2 3/10
-----------------------------------------------------
1 1/5 : 0,6 - 2 2/5 x 1,25
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a) 8:(-1⅗)-(4½·1⅔-3¾)
--------------------------- =
½·2½
8:(-8/5)-(9/2·5/3-3¾)
---------------------------- =
½ · 5/2
8·(-5/8)-(15/2-3¾)
=------------------------- =
5/4
-5-(7½-3¾)
= -------------- =
5/4
-5-3¾
= -------- =
5/4
= -8¾:5/4 = -35/4 : 5/4 = -35/4·⅘ = -5
b) ½-⅖:(1⅔-2⅕)
-------------------=
⅔ ·1½ - ¾
½ - ⅖:(1i 10/15 - 2i3/15)
= -------------------------------- =
⅔ · 3/2 - ¾
½ - ⅖ : (-8/15)
= ------------------- =
1 - ¾
½ - ⅖ ·(-15/8)
= ----------------- =
¼
½ + ¾
= --------- =
¼
= 5/4 : ¼ = 5/4 · 4 = 5
c) (⅔·2,7 - 7/15 : ⅓):1/25 ·(¾ - ⅙)
----------------------------------------- =
8/15 + 0,3
(2·0,9 - 7/15 ·3)·25·(9/12 - 2/12)
= ------------------------------------------ =
8/15 + 3/10
(1,8- 7/5)·25· 7/12
= -------------------------- =
16/30 + 9/30
(1,8-1,4)·25· 7/12
= ------------------------ =
25/30
= 0,4·25·7/12·30/25 = 0,7·10 = 7
d) (1/15+⅓):3/2 - (18¾-4,95):2i3/10
------------------------------------------- =
1⅕:0,6 - 2⅖·1,25
(1/15+5/15)· ⅔ - (18,75-4,95) : 2,3
= ---------------------------------------------- =
1,2:0,6 - 2,4·1,25
6/15 · ⅔ - 13,8:2,3
= ------------------------ =
2 - 1,92
4/15 - 6
= ------------ = -5i11/15 : 8/100 = -86/15 · 100/8 = - 215/3 = - 71⅔
0,08