如右图所示，由三个正方体木块粘合而成的模型，它们的棱长分别为1米、2米、4米，要在表面涂刷油漆，如果大正方体的下面不涂油漆，则模型涂刷油漆的面积是多少平方米？
= 2.5== 1== 1×= 3÷1%==．
×0=×=÷=÷=
直接写得数×8=﹣=÷3= 21×= 2÷=÷=×=+=
直接写得数．×6= 30×=÷= 20÷=+=××0=×= 1÷×=﹣50%=÷6=
直接写得数．×15=÷3=÷= 6×= 72÷=÷3= 2×=××10=
= 2.5
=
= 1
=
= 1
×
= 3÷1%=
=．
×0=
=
=
=
×8=
﹣
=
÷3= 21×
=
=
÷
=
×
=
+
=
×6= 30×
=
÷
= 20÷
=
+
=
×
×0=
×
= 1÷
=
﹣50%=
÷6=
×15=
÷3=
÷
= 6×
=
=
÷3= 2
×
=
×
×10=
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