ПОМОГИТЕ !!!!!!!!! ...........................................

Question

ПОМОГИТЕ !!!!!!!!!

...........................................

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Answer 1

1. 5:0,4=12,5
   2,88:0,8=3,6
   519,68:5,6=92,8
2. 5,4х-2,6х=10,84-2,3
   2,8х=8,54
   х=8,54:2,8
   х=3,05
3. (32,24*0,32+366,032*0,1):2,3-18,6388=(10,3168+36,6032):2,3-18,6388=46,92:2,3-18,6388=20,4-18,6388=1,7612