7.89×4.27 28.56÷5.1 102.6÷3.8．
直接写出得数 21×=÷2=×=÷=÷= 12÷= 1÷=×0=
直接写得数． 20×=÷=×=÷6=×12=×=
直接写得数．×=﹣=×=×=÷=÷=÷=÷=
直接写得数÷=×=﹣=×1.4= 12×= 24×=+= 0÷=
直接写得数== 3÷========
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÷2=
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= 12÷
= 1÷
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×0=
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÷6=
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×
﹣
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