3支钢笔的价钱等于7支圆珠笔的价钱。一支圆珠笔3元钱,1支钢笔多少元钱?;K0A9{*t.N9M1f+P5l
算式:提示(X.x+J.j'I)]3W.z5D1R2w5f;K0A9{*t.N9M1f+P5l
答:1支钢笔-F'I9}/o/z2{*L0L;n2p5L8R-a3k元钱。;K0A9{*t.N9M1f+P5l