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某校学生步行到郊外春游，一班的学生组成前队，速度为4km/h，二班的学生组成后队，速度为6km/h．前队出发1h后，后队才出发，同时，后队派一名联络员骑自行车在两队之间不间断的来回进行联络，他骑车的...
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甲乙两班同时从学校A出发去距离学校75km的军营B军训甲班学生步行速度为4km/h乙班学生步行速度
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计算2-1+÷=
已知am=3an=2则a2m-n的值为
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如图数轴上表示1的对应点分别为点A点B．若点A是BC的中点则点C所表示的数为 A． B． C． D．
求下列各式中未知数的值|a-2|=
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若=2=-3则b-a的值是
计算-3a42-a·a3·a4-a10÷a2
计算
计算的结果为
若x³=8则x=
化简---|-3|=
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已知5x-1的平方根是±34x+2y+1的立方根是1求4x-2y的平方根．
计算
若=0则m=
计算
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已知x≠0等于
计算
若分式中的xyz的值都扩大到原来的5倍则分式的值是原来的倍．
计算2×3
计算-+的值是
的平方根是
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