按下面图形的排列情况,算出第20个图形是什么?+}*U/}3h'M's2h5X)`/P
(1)△○○△○○△○○……+}*U/}3h'M's2h5X)`/P
(2)□△○△□△○△□△○△……+}*U/}3h'M's2h5X)`/P
(3)☆△△□○☆△△□○☆△△□○……+}*U/}3h'M's2h5X)`/P
(4)○△△☆☆☆○△△☆☆☆……+}*U/}3h'M's2h5X)`/P
答:(1)第20个图形是;W4Z0P:|)m3^2\0Y)Z。+}*U/}3h'M's2h5X)`/P
(2)第20个图形是7l2f-P1M7L4z/C2o7x8_*u'@;v。+}*U/}3h'M's2h5X)`/P
(3)第20个图形是1~-e'A1k9i'z6O(M:k。+}*U/}3h'M's2h5X)`/P
(4)第20个图形是+}7?,G/z6h;D.[:n8C.h,@)n/^-G。+}*U/}3h'M's2h5X)`/P