直接写得数．
+
= 
﹣
= 
+= 0.7×8= 0.56÷1.4= 7.5×0.2=
0.56÷1.4= 20.5÷0.5= 5÷25= 0.2×0.4= 2÷0.5= 2.6+2.4×2=
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=
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