80:160=1:2125:1000=1:81.25:10=1:850:1000=1:2010000:1000000=1:100852+528-369+969=1380+600=198055×22x100÷50=11x5x2x11x2=10x121x2=242025x125x32=25x4x125x8=100x1000=10000012345679x9x6=111111111x66=666666666