兰兰写了6天大字，前5天每天写3张，最后一天写了4张，兰兰一共写了多少张？*B(C1X9V/x3};`)})n1h+j5u
算式：提示1h)i:q+E/j/c7]-~6f.m+P*B(C1X9V/x3};`)})n1h+j5u
答；兰兰一共写了.D8?:U1H,D2c'l)l*Q:F6?.]张。*B(C1X9V/x3};`)})n1h+j5u