(﹣四分之三﹚÷﹙﹣五分之九﹚-﹙0.5﹚²×4

问题描述:

(﹣四分之三﹚÷﹙﹣五分之九﹚-﹙0.5﹚²×4

(﹣四分之三﹚÷﹙﹣五分之九﹚-﹙0.5﹚²×4
= (3/4) × (5/9) - 1
= 5/12 -1
= - 7/12