1.7
-
-
0.2=0.05
×
×
30．
分析：解答此題要通過觀察數(shù)的特點來進(jìn)行，先看等號右邊，若填“÷、-、+”，不論等號右邊填任何符號，兩邊得數(shù)都不可能相等，所以右邊應(yīng)填“×”，則0.05×30=1.5，故等號左邊應(yīng)填“-”．
解答：解：1.7-0.2=0.05×30．
故答案為：-，×．
點評：此題是考查對運算符號的具體運用情況，以及對小數(shù)四則混合運算計算方法的掌握情況．
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