通分.和; 和.
直接写出得数.24×= 1÷=×12= ×18÷3=÷= (﹣)×=×÷×=
直接写得数.= = = = = == = = = = =
直接写得数.×= ×12= ×=÷= ÷= 9×=÷═ ÷12=
直接写得数.= = =3.2÷40%= = == =
直接写出得数.×= ﹣= 0÷=5÷= 70×=