充要条件-中职数学基础模块教案设计

1.4121.2..2(90)*1.4*1.p1xq210x2.p(3)(1)0xxq1x3.p2xq240xq240xp2x1pqqp2pqqp3pqqp15*pq1pqpqpq1p1xq210x2qppqpq2p(3)(1)0xxq1x3pqpqpqpq3p2xq240x.30*1pq1pxyqxy2p2xq0x1xyxy-11xyxypqpq222x0x20x2xpqpqpqpqpqpq2pq1p3xq5x2p20xq250xx3p63xq12x13x5x4x43455x3xpqpq220x250xx250xx20x5x250xxpqpq363x12x12x63xpq50*1.4pqp0aq0abpabq20abp1aq1ap0aq0a60*1pqpqpqqp.2..70*3pq(1)p(x-2)(x+1)=0qx-2=0(2)pq(3)px=1qx2=1(4)pq.(1)(x-2)(x+1)=0x=2x=2(x-2)(x+1)=0pq.(2)pq(3)x=1x2=1x2=1x=1pq(4)pq80**85*(1)1.41.4(2)1.41.4(3)90