判断题中的两种量是不是成比例，成什么比例，并说明理由．长方形周长一定，长和宽 ．
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25×8= 8.5﹣3.7= 0.56÷0.07= 4×9.2×0.25======
直接写出结果． 12÷0.4= 9.9×50= 2+0.75=+= 3+= 0.5×40= 2﹣=﹣=
10﹣4.2= 8×12.5%= 26.26÷26= 1.2﹣=÷20= 400÷5÷8= 70+30×2= 0.25÷=+2= 0.3+=
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=
=
=
=
=
+0.75=
=
= 0.5×40= 2﹣
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﹣
=
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÷20=
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+2= 0.3+
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