如图，边长为12的大正方形中有两个小正方形，若两个小正方形的面积分别为S1，S2，则S1+S2的值为多少？
直接写出得数﹣= ﹣= ﹣= +=+= ﹣= += ﹣=
直接写出得数．+= ﹣= += ﹣=10﹣﹣= = = ==．
直接写得数= = = == 1﹣= 1﹣= =
直接写出得数.+= 1﹣= ﹣= 2.5×3.8×4=+= 10﹣9.12= +0.25= 0.65×9+0.65=
计算下面各题，能简算的要简算． ．
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﹣
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﹣
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﹣
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﹣
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﹣
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= 1﹣
= 1﹣
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= 1﹣
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﹣
= 2.5×3.8×4=
+
= 10﹣9.12= 
+0.25= 0.65×9+0.65=
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