3月12日植树节，学校组织学生去植树，某校九年级(3)班班长领到一批树苗，若每人植4棵树，还剩下37棵 设树为x。人数y.4X 38=yY-6(x-1)<；3
3月12日是植树节，在第______季度，今年这个季度有______天． 3月12日是第一季度；2012÷4=503；没有余数，2012年是闰年，二月份有29天，第一季度一共有：31+29+31=91（天）；故答案为：一，91．
书面表达 解析：An Instructive Day Today is March 12 our national Tree Planting Day.Our Class observed the day by planting trees.In high spirits we talked and smiled all the way.As soon as we got to a piece of wasteland far from the school we began to work.Some were engaged in digging holes；some were busying themselves in covering the roots of the young trees with earth and watering the trees one by one.We worked so hard that soon each of us was wet in sweat.On the way home we kept on singing up because we've done a good thing to make our homeland green.
