2(2x+y)-3(2x+y)+8(2x+y),其中x=3/4,y=1/2
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2(2x+y)-3(2x+y)+8(2x+y),其中x=3/4,y=1/2
2(2x+y)-3(2x+y)+8(2x+y),其中x=3/4,y=1/2
2(2x+y)-3(2x+y)+8(2x+y),其中x=3/4,y=1/2
原式=(2-3+8)(2x+y)
=7(2x+y)
=7(3/2+1/2)
=7*2
=14
原题=7(2x+y)=7(2*3/4+1/2)=14
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