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1.
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【 】
A.
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x+2=0 B.
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x+7=5-3x
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4x=2
C.
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3
5
x=4
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x=12
5
D.
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-4(x-1)=-2
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4x=-6
2.
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A.
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(1),
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x=2-4y
3
B.
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(1),
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y=2-3x
4
C.
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(2),
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x=y+5
2
D.
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y=2x-5
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A.3x-4y+2z=3 B.1
3
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C.x+y-z=-2 D.x
2
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3
y-z=15
6
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A.1 B.-1 C.-2 D.2
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【 】
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【 】
A.2×1000(26-x)=800x B.1000(13-x)=800x
C.1000(26-x)=2×800x D.1000(26-x)=800x
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