用192分米长的铁丝围成一个长方形，长方形的长与宽的比5：3，这个长方形的面积是多少？
直接写出得数．×60= 12÷= 3.14×42=（）2=×=+=÷=÷=
直接写得数．×4=+=+=÷= 25÷=﹣=÷5=×= 2÷=﹣=×12= 2﹣﹣=
口算========
直接写出得数．== 11=== 0÷1.2======= 12=== 54=
直接写出得数×=×=×18=÷8= 6÷=××=÷=÷=÷÷= 0.25+=﹣=÷×=÷=×= 8﹣4÷=﹣=÷14= 12×（﹣）= 5%×5=+++= 3.75+= 63%﹣27%=（1﹣20%）÷20%= 0.4÷=×1.8=×25%=
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