x×1+4×y等于多少？ 2的x+1次方乘4的y次方等于128 X+Y等于多少？
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2013x\u226411111\uff0c\u6c42\u5f97x\u53ea\u80fd\u4e3a1\uff0c3\uff0c5
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x=1\u65f6\uff0c111-13=98\uff0c98\u4e0d\u662f4\u7684\u6574\u6570\u500d\uff0c\u820d
x=3\u65f6\uff0c111-39=72\uff0c72\u662f4\u7684\u6574\u6570\u500d\uff0cy=1268
x=5\u65f6\uff0c111-65=46\uff0c46\u4e0d\u662f4\u7684\u6574\u6570\u500d\uff0c\u820d
\u6240\u4ee5y=1268
2^\uff08x+1\uff09\u00b72^(2y)=2^7
\u53ef\u5f97 x+2y+1=7\uff1b\u4ece\u800cx+2y=6\uff1b
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\uff08x=0\uff0cy=3\uff1b\u4f46\u662f\uff01\uff010\u4e0d\u662f\u6b63\u6574\u6570\uff09
\uff08x=1\uff0cy=2.5\u975e\u6574\u6570\uff09
\uff08x=2\uff0cy=2\uff09
\uff08x=3\uff0cy=1.5\u975e\u6574\u6570\uff09
\uff08x=4\uff0cy=1\uff09
\uff08x=5\uff0cy=0.5\u975e\u6574\u6570\uff09
\uff08x=6\uff0cy=0\uff1b\u4f46\u662f0\u4e0d\u662f\u6b63\u6574\u6570\uff01\uff01\uff01\uff01\uff09
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你除x乘1+4乘y等于多少。那就是x加4y呗你这都是未知量两个未知数然后你那图片照的也不清楚。
解:由 |x|=4 且 |y|=1/2 可得:
x=±4 且 y=±1/2 又 xy<0 故 "x=4 且 y=-1/2" 或 "x=-4 且 y=1/2" 当"x=4 且 y=-1/2" 时: x/y=4/(-1/2)=-8 当"x=-4 且 y=1/2" 时: x/y=(-4)/(1/2)=-8
解:由 |x|=4 且 |y|=1/2 可得:
x=±4 且 y=±1/2 又 xy<0 故 "x=4 且 y=-1/2" 或 "x=-4 且 y=1/2" 当"x=4 且 y=-1/2" 时: x/y=4/(-1/2)=-8 当"x=-4 且 y=1/2" 时: x/y=(-4)/(1/2)=-8
解:由 |x|=4 且 |y|=1/2 可得: x=±4 且 y=±1/2 又 xy<0 故 "x=4 且 y=-1/2" 或 "x=-4 且 y=1/2" 当"x=4 且 y=-1/2" 时: x/y=4/(-1/2)=-8 当"x=-4 且 y=1/2" 时: x/y=(-4)/(1/2)=-8
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