用铁皮做一个水箱的容积是200升，这个水箱的底面积是一个边长为50厘米的正方形，做这个水箱需要用多少铁皮？
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=﹣=
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