自来水公司铺设一条长2100米的供水管道，前3天铺了全长的15%．照这样计算，铺完管道一共要多少天？
直接写得数． 45×= 1÷= 1÷÷=×= 1.8﹣40%=
直接写得数 ×=÷=×=÷= 4÷=×6÷= 6×+6×=（+）×16=×= 24%×5=
口算小博士．×=÷2= 80%﹣20%= 4×25%+16×25%=×=×72%=×÷=×÷×=
直接写得数．×= 1÷= 4×60%= 0.875÷0.125= 0.25××4=÷2= 10÷=×3.6=（）2=÷×0=
口算：×= 45×=÷10= 0÷8= 5.4×=÷= 0.65×= 50%﹣0.05=
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