=-27/8×9/25-43/19×19/43×（-27/8）+16/25×27/8

=-27/8×9/25+27/8+16/25×27/8

=27/8（16/25-9/25+1）

=27/8×32/25

=108/25


=-2×9-（-1）÷0.5

=-18+2

=-16



回答满意望采纳,谢谢.