用A、B、C三種木地板拼成一個5×5的正方形，要求把三種地板都用上．如果拼成的兩個正方形中有兩種地板用的數量不同，就算做不同的拼法．問共有幾種不同的拼法？
口算．============
直接写得数×12= 0.45×2= 34×0.2=÷2= 10×= 9.9+2.43+0.1=×= 6.8×2.5=
直接写出得数．×= 40%+50%= 81÷= 9.9÷0.1= 3.52+6.48= 1%÷=×2÷×2=
直接写出得数： 7×=÷6=÷=÷=÷=×0.15=÷=4×60%=
直接写得数．×8=÷2=÷=×= 10×=﹣=+= 21×=÷9=÷=
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×12= 0.45×2= 34×0.2=
÷2=
= 9.9+2.43+0.1=
×
= 6.8×2.5=
×
= 40%+50%= 81÷
= 9.9÷0.1=
=
×2÷
=
÷6=
÷
=
÷
÷
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×0.15=
÷
=4×60%=
×8=
÷2=
÷
=
×
=
=
﹣
=
+
= 21×
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÷9=
÷
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