0.5÷[一（一）]
93.6÷[(54.8+45.2)×0.06]
0.8+0.55+1.2-0.45
+-
1--
口算。+= -= += - +=0.63×1000= 0. 75-0.25= 0.07+0.03= 0. 9÷0.03= 0.4×0.8=
一（
一
）]
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-
+
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