1. 24,892:5,08=4,9.
33,6•6,5= 218,4
4,9+218,4=223,30
223,30-230= - 6,7
2. 6,22•4,7=29,234
4,8076:4,04= 1,19
29,234-1,19=28,044
28,044+1,956=30
3. 68,16:3,55=19,2
51,4•0,16=8,224
19,2+8,224=27,424
27,424-28,004= - 0,58
4. 7,06•1,02=7,2012
69,531:9,03=7,7
7,2012-7,7= - 0,4988
- 0,4988- 0,5012= - 1