下图是一块正方形草坪，阴影部分是两个正方形房子，请你算出草坪的面积。
直接写出下列题目的得数． 7+66.3=÷=×÷= 14÷=÷20%=（+）×20=
口算．============
直接写得数×12= 0.45×2= 34×0.2=÷2= 10×= 9.9+2.43+0.1=×= 6.8×2.5=
直接写出得数．×= 40%+50%= 81÷= 9.9÷0.1= 3.52+6.48= 1%÷=×2÷×2=
直接写出得数： 7×=÷6=÷=÷=÷=×0.15=÷=4×60%=
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÷20%=（
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）×20=
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×12= 0.45×2= 34×0.2=
÷2=
= 9.9+2.43+0.1=
×
= 6.8×2.5=
×
= 40%+50%= 81÷
= 9.9÷0.1=
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×2÷
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÷6=
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×0.15=
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=4×60%=
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