蛐蛐和蜘蛛共20只，腿144条，蛐蛐和蜘蛛各几只？(o)i+y9~+F/@:H5g4u8m0L(i;G9W,x
算式：提示+B9~3D;I4Z9c(o)i+y9~+F/@:H5g4u8m0L(i;G9W,x
答：蛐蛐有-i2T-_2c9v只，蜘蛛有+B(O/a5~2j)v1~2t只。(o)i+y9~+F/@:H5g4u8m0L(i;G9W,x