小明和小强的图书本书比是12：7，如果分别给他们加上6本，他们的本书比为3：2，原来他们各有多少本图书？
直接写出得数．÷6= 15÷= ×=÷= 42×= ﹣60%=10﹣99%= 40%×=
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%= = == =
÷6= 15÷
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