把2x+3y=14和6x+13y=41相加,得8x+16y=55
再把8x+16y=55除8,得x+2y=55/8=6.875 约为7,故选B
如果满足2X+3Y=14,6X+13Y=41,则X+2Y的值是
如果满足2X+3Y=14,6X+13Y=41,则X+2Y的值是
A.5 B.7 C.7.5 D.9
明白么？不是只要ABCD,
A.5 B.7 C.7.5 D.9
明白么？不是只要ABCD,
数学人气：491 ℃时间：2020-03-24 12:47:38
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