2,86-4,5·(19,4-7·91)+45=

1)19,4-(7·91)=19,4-637=-617,6

2)-4,5·(-617,6)=2 779,2

3)2,86+2779,2=2782,09

4)2782,09+45=2827,09

(-2,3)²-0,32+5,5-(-1)·2,3³=

4,9-0,32+5,5+1·8,27=

4,9-0,32+5,5+8,27=

4,58+13,77=18,35