搭三角形。0?/|9s2`
（1）搭6层，增加的1层有)M/b9X9g(e,p0N(J1Z个△，共)S'[:S3F4d+C;V;X3`:M个△；0?/|9s2`
搭7层，增加的1层有9Y:T0\9M;G个△，共-V'K3q'~-s.O个△；0?/|9s2`
搭a层，增加的1层有/Y4D3H6t:Z.J9U/G2C(\个△，共7D4L/X,H2L:b个△。0?/|9s2`
（2）搭100层共需:D3}-L+F8W3~)@8c,G'R5S-L7z个△，搭,W+j;r0r7u0i8`:k/q-_-X(K9v5b+Z层要用81个△。0?/|9s2`