口算．2.5+3.7= 12﹣0.8= 0.64﹣0.06= 0.69+2.31= 2.36+8.7=9.8﹣8.9= 0.52+0.4= 0.83+1.7= 0.87﹣0.46= 0.08+5.92=
直接写得数．×=×12=×=÷=÷= 9×=÷═÷12=
直接写得数．=== 3.2÷40%=====
直接写出得数．×=﹣= 0÷= 5÷= 70×=
计算 0.62=×= 4×60%= 0×=÷2= 10÷=×3.6= 0.875÷0.125=
找准对应．（12）
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×
=
×12=
×
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÷
=
÷
= 9×
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÷
═
÷12=
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=
=
=
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×
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﹣
= 0÷
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= 70×
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×
= 4×60%= 0×
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÷2= 10÷
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×3.6= 0.875÷0.125=