能简则简 +++= ﹣（+）= ×÷= ﹣+= ××= ×÷6=
(2.4×1.5-1.5)÷0.7
(3.2+3.2+3.2+3.2) ×2.5
＋－
3600÷45×90
(2.5-2.5×0.6)÷0.4
+
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+
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×
=
﹣
+
= 
×
×
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×
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