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已知函数y＝kx﹢b的图像经过第一,二,三象限,则不等式kx＋b＞0的解集为多少?请分析
因为经过一、三象限,说明k>0,经过第二象限说明与y轴交于正半轴,说明b>0
所以不等式
kx b >0
kx> -b
x> -b/k... -
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甲乙丙三数,甲数与乙数之比为1：3,乙数与丙数之比为2:5,
甲乙丙三数,甲数与乙数之比为1：3,乙数与丙数之比为2:5,若甲数与丙数之和比乙数的三分之四还多27,求这三个数设乙为x,则甲=x/3;丙=5
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将下列句子变为间接引语.1.He said to me,"I am wery happy to visit you."
2.The teacher told Jim that don't eat in class.3.The teacher said to the class that light travels much faster than sound
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