用一根长26厘米的铁丝，围成一个最大的正方形，还剩多少厘米？
直接写得数．×16= 12÷= 0.3×=÷= 1÷= 0×===
直接写得数 4÷= 0×=÷=×1.4=×= 0÷=×10= 30×0.05=
直接写出得数．========
口算． 4.2÷=×3=÷5=（+）×72=×12=×1.8=÷=
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×16= 12÷
= 0.3×
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÷
= 1÷
= 0×
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= 0×
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×1.4=
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×10= 30×0.05=
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×3=
÷5=（
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）×72=
×12=
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