计算:12.5×7.8×0.8 [8.85﹣(1.5+3.75)]÷1.8 4.5﹣3.2+3.6÷1.44 0.91÷0.5÷2.6.
8360﹣(201+438÷73)
(186×47﹣4524)÷6.
7086﹣42×480÷560.
脱式计算66﹣17+2356﹣28÷781÷(32﹣23)83﹣(54﹣9)
2772÷28+34965÷35.