用4块边长是8厘米的正方形，拼成一个大正方形，这个大正方形的周长是多少厘米？
直接写得数×8=﹣=÷3= 21×= 2÷=÷=×=+=
直接写得数．×6= 30×=÷= 20÷=+=××0=×= 1÷×=﹣50%=÷6=
直接写得数．×15=÷3=÷= 6×= 72÷=÷3= 2×=××10=
20×=÷=
24×= 15÷=×=÷= 1÷25%=+= 3×÷3×50%=（1﹣1%）÷99%=
×8=
﹣
=
÷3= 21×
=
=
÷
=
×
=
+
=
×6= 30×
=
÷
= 20÷
=
+
=
×
×0=
×
= 1÷
=
﹣50%=
÷6=
×15=
÷3=
÷
= 6×
=
=
÷3= 2
×
=
×
×10=
=
÷
=
= 15÷
=
×
=
÷
=
+
÷3×50%=（1﹣1%）÷99%=
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