脱式计算，能简算的要简算．
①85×54÷18+745 ②3.4÷[（1.25+0.45）×2] ③1080+270÷18﹣864
④7.54+
+2.46+
⑤（2.4﹣
）÷0.625+
⑥98.9×99+98.9．
脱式计算，能简算的要简算．
①85×54÷18+745 ②3.4÷[（1.25+0.45）×2] ③1080+270÷18﹣864
④7.54++2.46+ ⑤（2.4﹣）÷0.625+ ⑥98.9×99+98.9．
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