1.已知-x+2y=6,则3(x-2y)²-5(x-2y)+6的值为多少?2.观察下列各等式:1/2*2=1/2+2,3/2*3=3/2+3,4/3*4=4/3+4……设n表示正整数,用关于n的等式表示这个规律为:( )*( )=( )+( ).3.含有未知数( )是
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