佳园小区为了美化环境，净化空气，在小区内铺了一块面积231平方米的草坪，草坪宽7米，现在把宽增加到35米，长不变，扩大后的面积是多少？
+= ﹣= += +=1+= 2﹣1= ﹣= 3﹣=1+2= ×= 7﹣4= ×13=×4= 8×= ÷= 5÷=÷8= 8÷= 3÷= ÷=
直接写得数．1﹣+= 1.25×0.8= 72÷= 10.6﹣5.62=0.33= 11.1÷0.3= ×= 4.1×25+3.9×25=
直接写出得数．+= ÷= 3﹣1.95= ×= 6.3÷0.07=÷6= 0÷= ﹣= +3÷= ×﹣0.75×=
+= 1﹣= 1÷=﹣= ×= 0÷=0.9+99×0.9= （+）×12= ．
直接写出得数1÷= += ÷= ÷3= ×=﹣= ÷7= ÷= 4×= ÷8=×= ÷= ÷0.5= 5×= ﹣=×0= 0.3×= ÷= ÷4= +0.5=
+
= 
﹣
= 
+
= 
+
=
+
= 2
﹣1
= 
﹣
= 3
﹣
=
+2
= 
= 7﹣4
= 
×13
=
×4= 8×
= 
÷
= 5÷
=
÷8= 8÷
= 3
÷
= 
÷
=
+
= 1.25×0.8= 72÷
= 10.6﹣5.62=
×
= 4.1×25+3.9×25=
+
= 
÷
= 3﹣1.95= 
×
= 6.3÷0.07=
÷6= 0÷
= 
﹣
= 
+3÷
= 
﹣0.75×
+
= 1﹣
= 1÷
=
﹣
= 
×
=
+
）×12= 
．
= 
+
= 
÷
= 
÷3= 
×
﹣
= 
÷7= 
÷
= 4×
= 
÷8=
×
= 
÷
= 
÷0.5= 5×
= 
﹣
=
×0= 0.3×
= 
÷
= 
÷4= 
+0.5=
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