张大伯和李二叔两家分别住在一段公路的两边．张大伯家要修一条最短的小路与公路连接，李二叔家要修一段与公路平行的小路到小学．应该怎样修？请你帮忙在图中画出来．
直接写出得数．×=÷=÷= 1.8÷= 0.2÷3=÷=×=××0=×÷×= 18÷÷=
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×=
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