测测你的综合能力．（1）一个正方形的边长增加2厘米，面积增加了20平方厘米，扩大后正方形的面积是多少平方厘米？（2）一个长方形的长与宽分别增加2厘米，面积增加了20平方厘米，求扩大后长方形的周长是多少厘米？
直接写出得数．×25=÷6= 0.54+O.46= 9﹣= （）×30== 177+99= 3÷7== 0.9×99+0.9=
×16=×=﹣=×= 6÷=÷=÷4=÷=+=﹣= 100×= 8×= 1÷=﹣= 12÷= 0×=
直接写得数．×0=×=×12=×= 45×=÷=×=÷= 18×=×= 1÷=÷=
直接写出得数．×12=÷=（ ）2= 4﹣4×= 1×= 43÷=÷=×8+×8= 0.9×= 12×﹣=×7÷×7==
直接写出得数．÷= 0×=÷=÷1=÷= 1+=×=×=
×25=
÷6= 0.54+O.46= 9﹣
=
）×30=
= 177+99= 3÷7=
= 0.9×99+0.9=
×16=
×
=
﹣
=
×
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÷
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÷4=
÷
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+
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= 100×
= 8×
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﹣
= 12÷
= 0×
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×0=
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×12=
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÷
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×
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= 1÷
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×12=
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）2= 4﹣4×
= 1
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= 43÷
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×8+
×8= 0.9×
= 12×
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×7÷
=
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= 1+
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×
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