在如图中绘色表示出0.30和0.3，观察并分析．观察如图的两幅图，我发现了 ．
直接写出得数（最后4题为估算）：×= 1﹣+= 0.6×= 5.2÷（1+0.3）=87×22≈ 724÷31≈ 816+991≈ 7.18×5.89≈
直接写得数×= ×21= ×= ×=32×= ×= ×= ×5=
直接写得数．= = = == = = （﹣）×30=
直接写出得数．14×= ×5= ×= 12×= 3×=7×= 4.8+0.82= 3﹣2.7= （+2）×9= （﹣）×2=
口算题．×= ×= ×9= ××0=+= ×11= 5﹣﹣= ×9×7=
×
= 1﹣
+
= 0.6×
= 5.2÷（1+0.3）=
×
= 
×21= 
×
= 
=
= 
×
= 
×
= 
×5=
= 
= 
= 
=
= 
= 
= （
﹣
）×30=
= 
×5= 
×
= 12×
= 3×
=
= 4.8+0.82= 3
﹣2.7= （
+2）×9= （
﹣
）×2=
×
= 
×
= 
×9= 
×
×0=
+
= 
×11= 5﹣
﹣
= 
×9×7=
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