在方格纸上按要求画图．（1）按3：1的比放大长方形，画出放大后的图形．（2）画一个面积是三角形2倍的梯形．
你能直接写出下列各题的结果吗？试试看×=÷=××= 4.5%=×12=÷4= （+）×== %
计算．×÷÷××÷6×÷7÷．
直接写得数．= 24÷======
直接写出得数． 12×=÷= 0÷=﹣= 12×（×）=×=÷= 20÷=+=×90×=
直接写出得数：×12= 1÷=×=+=÷2= 6﹣= 0÷=×=÷=﹣=
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= 24÷
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= 20÷
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×12= 1÷
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