、3(x1)2(x2)2x3 3xx81 x1xx21
2x12x56x72361
x1x2364x21
15(x15)1123(x7)
2336
x22xx223
3x13x22x30.1x22105 0.2x10.020.53x0.170.20.7x0.031
y1x22xy1x2y1503 4
2x3y50
xy7xy242xy5xy2
3x5y86x7y1
2x53(x 2)x12x 3
2am2﹣8a; 4x3x2y14x3y3003x2y2xyxy13x2y2456 2xy22xy8x2y5 3xy7 3x4y3(3x2)45x3x1)5(x43x1(2x1)x1 x12x1
2x3x1232(x1)4x3+4x2y+xy2 x2y﹣2xy2+y3; x+2y)2﹣y2.
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