数学课本的封面是一个长方形．请你拿出数学课本先估计它的面积，再测量它的长和宽，并计算面积．
直接写出得数． 3×=÷0.5= 9÷=÷﹣= （1﹣）÷= 2÷×=
直接写得数．×6= 30×=÷= 20÷=+=××0=×= 1÷×= 5.6÷0.08= 39××=
直接写得数．﹣=÷=×=×= 10×=×=÷=÷= 15×=÷=+=÷22=
直接写出得数．=========．
直接写出得数．÷10=×= 1÷= 8×= 1+=÷=×÷= 1÷6×=
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