如图，已知长方形ABCD的面积是88平方厘米，E和F分别是长和宽的中点．（1）画出长方形ABCD的所有对称轴．（2）求出阴影部分的面积．
直接写得数×8=×= 81÷=÷= 63÷=÷=××= 3×÷3×= 36×25%=（﹣）×24=
直接写出得数： 25×= 1.8×=÷=÷3=﹣=﹣=（+）×30=÷×=．
直接写出得数 （1）6×=×=××2=+×0= （2）÷= 4.8÷=÷37.5%= 15%×60= （3）16：24=：= 1÷（0.36+0.14）=×÷×=
×10=÷=÷80%= 8×12．%=×0×=﹣= 0.5+=×=÷3= （﹣）×=
口算．×=+=×===×5=÷2=﹣=
×8=
×
= 81÷
=
÷
= 63÷
=
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=
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×
= 3×
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= 1.8×
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+
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×
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= 4.8÷
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÷37.5%= 15%×60=
：
= 1÷（0.36+0.14）=
×
÷×==×=××2=+×0=÷= 4.8÷=÷37.5%= 15%×60=：= 1÷（0.36+0.14）=×÷×=
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