脱式计算．你是最棒的！1-12×{1-13×[1-14×（1-15）]}55117×1718+145111×11129999×9999+1999977×13+255×999-51012x-3+（2x-5）=1755%x-（0.25x+0.6）=0.6．

Question

脱式计算．你是最棒的！ 1-(1)/(2)×{1-(1)/(3)×[1-(1)/(4)×（1-(1)/(5)）]}	55(1)/(17)×(17)/(18)+145(1)/(11)×(11)/(12)	9999×9999+19999
77×13+255×999-510	(1)/(2)x-3+（2x-5）=17	55%x-（0.25x+0.6）=0.6．

Answer 1

（1）1-12×{1-13×[1-14×（1-15）]} =1-12×{1−13×[1−14×45]}，=1-12×{1-13×[1-15]}，=1-12×{1-13×45}，，=1-12×{1-415}，=1-12×1115，=1-1130，=1930；（2）55117×1718+145111×1112=93617×1718...