儿童三轮车每辆的价钱是90元。幼儿园买了4辆，一共用了多少钱？0D1t.r;]'z;k)u(X5\
算式：提示;r5`4Z*D,q'o.g(k(V;P6]3P0o0D1t.r;]'z;k)u(X5\
答：一共用了+h.U-W(m:W'j2i,z元。0D1t.r;]'z;k)u(X5\