下图中的正方形被分成了4个相同的长方形，每个小长方形的周长都是40厘米．求这个正方形的周长？
直接写出得数．=========
直接写出得数．÷= 0×=÷= 1+=×=÷=×=÷=
直接写得数．×8=÷== 6÷=÷= 21×= 1﹣÷=×=
直接写出得数． 1÷100÷10= 1﹣=+1÷3= 6×= 60%÷12=×=÷= 500×3%=
直接写出得数：×8=÷2=÷=×=×= 1÷=÷60%=×15=﹣= 6.8÷10%= 4.5+=×=
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+1÷3= 6×
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= 500×3%=
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÷60%=
×15=
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