三角形ABC是直角三角形,阴影部分①的面积比阴影部分②的面积小28平方厘米.AB长40厘米,BC长多少厘米?.P.d(H5Q7R'M:_
.P.d(H5Q7R'M:_
算式:提示+Q-K)d3b.w8v(i.P.d(H5Q7R'M:_
答:BC长9O1L9t-[8a8B(T厘米.P.d(H5Q7R'M:_