这是一块正方形的地板砖示意图．其中AA1=AA2=BB1=BB2=CC1=CC2=DD1=DD2，红色小正方形的面积是4，绿色的四块面积总和是18．求这个大正方形ABCD的面积，请说明理由．
+= 8÷=×= 3÷= 4×==÷===
直接写出得数．﹣=×=÷6= 1﹣10%=÷=÷= 1÷20%=+=×= 20×90%=
直接写出得数．÷=÷3= 12×= 2﹣=+=×= 2÷=+= 20÷=×=
+=×=+120=×120=×= 40﹣2=×=+﹣=
直接写出得数 170×400= 0.32×500= 3.5×200= 1.5﹣0.06= 0.75÷15= 1.01×99=+= 0.51÷17= 32.8+19.01= 4.9×0.7= 0.87﹣0.49= 17.5﹣（2.5+3.8）=
+
= 8÷
=
×
=
= 4×
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=
÷
=
=
=
﹣
=
×
=
÷6= 1﹣10%=
÷
=
÷
= 1÷20%=
+
=
×
= 20×90%=
÷
=
= 2﹣
=
+
=
×
= 2÷
=
+
=
=
×
=
+
=
+120=
×
= 40﹣2
=
×
=
+
﹣
=
+
= 0.51÷17= 32.8+19.01= 4.9×0.7=
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