人教版九年级数学下册中考复习课件第二章方程与不等式C C4 430 x30 x70y70yx xy y505030 x30 x70y70y2 3002 30030m30m70n70n9 5009 500(50(5030)m30)m(100(10070)n70)n(50(5030)m30)m(100(10070)n70)n5 0005 0001.5w1.5w0.8(1.5w0.8(1.5w5)5)B BA AA AD D2 2122325aa1 1x x2 2或或x x2 2或或x x3 32 0002 0005x6y14xy5yx B BA AD DD D4k3 9c8B BC C1k=31kk03 且 1kk03且 1k3 D DB BC C(x(x2)2)2 25 52 216162 5002 5002 500(12 500(1x)x)2 500(12 500(1x)x)2 29 1009 100a1a114a0a0a07 74 4121210%10%8 812121.5x1.5x2001200200=8xx1.5xx1x1且且x2x2x x2 23(2x3(2x1)1)x x3 34 43 3m2m2且且m3m31 1或或2 218186 6D DA AB Bx4x4aa1 1mm1 11x2-1-15 5D DB B
