在横线上填上“+”“-”“×”或“÷”。0S-k.e)U4p)O2z
5请选择×√7m8b-N4K7S5W+Z3l8T6f(g)C3=15 141},{6o-M7=21 12*n5M'y,N;l)C.v-X6T6=20S-k.e)U4p)O2z
9请选择√×0V:m.I8@.R(c5= 45 160Z:~3N4R*X4G:v+E.K-u8=8 4(];o0f-k4R)^(U.^2=20S-k.e)U4p)O2z