第一题,等同于已知三角形的两边长度求第三边,没夹角或者三点坐标的情况下是不能确定第三点的.
第二题,0.15x+0.29y=4.40,x=y,俩条件刚好组成方程组.所以会有唯一解.
GMAT 充分性的问题Q16:If J,S,and V are points on the number line（数轴
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