脱式计算，能简算的要简算．①23+（56-34）÷38②32×40+450÷18③920÷12×（25+45）④34×34+14×0.75-75%⑤3.6-2.8+3.4-7.2．

Question

脱式计算，能简算的要简算．  ①(2)/(3)+（(5)/(6)-(3)/(4)）÷(3)/(8)	②32×40+450÷18	③(9)/(20)÷(1)/(2)×（(2)/(5)+(4)/(5)）
④(3)/(4)×(3)/(4)+(1)/(4)×0.75-75%	⑤3.6-2.8+3.4-7.2．

Answer 1

①23+（56-34）÷38，=23+112÷38，=23+29，=89；②32×40+450÷18，=1280+25，=1305；③920÷12×（25+45），=920÷12×65，=910×65，=2725；④34×34+14×0.75-75%，=34×0.75+14×0.75-0.75，=（34+14-1）×0.75...