一块长方形果园，长下50米，宽40米，现要在图周围上2圈铁丝（接头处不算），铁丝长多少米？
×=÷=×= 2×=÷=÷3=+=﹣=
直接写出得数 3×= ×= ×18= ×= = ÷= ÷= 3×= ．
直接写得数．========
12+9.9= 1÷0.25=÷=×50%=﹣=（0.75﹣）×96=
直接写得数．+= 6÷=÷4= 2×=÷5= 24÷=×=÷=×24=×=÷=×=
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×18= 
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×50%=
﹣
=（0.75﹣
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= 6÷
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÷4= 2×
÷5= 24÷
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