直接写出得数． 12÷= 1÷0.01= 9.8÷0.7= ××= += 42×40= 179+387﹣287= 0.5×16×2=
＋＋
×÷
(2.4×1.5-1.5)÷0.7
(3.2+3.2+3.2+3.2) ×2.5
＋－
= 1÷0.01= 9.8÷0.7= 
×
×
=
+
= 42×40= 179+387﹣287= 0.5×16×2=
＋
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×
÷
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