5 + 7 15\r02P- 9 2- ~ 9 2~ ~ 2 2 +@ +P\rl z X 2 2 x 3 3 X4 72 X 82\r22-12 ` 32-22 42-32 ` 82_72\rI 2 X 22 22 x 32 32 x 42 72 X 82\r6 6 L6 6,1 - 1\r72 82\r64\r= \r64\r?? !"#$%&`'(#$%0@)&* ? %+,p\r12. (8 #)?./p\r(1) 2 2x+l J + x\r3 2\r(2) 4X-6 _3X-1\r5 0 4\r?#1? ( 1 ) 2345%67./%89:;<=6 , >./?@1 2 -2X (2x+l) =3X (l+ x ) ,\rABCD>./?@10 - 4x=3x+3,./%89:;E=4 x ,>./?@7x+3 = 1 0 ,./%89:;\rFA3 , ./%89:;GH7 I?J\r(2 ) 2345%67./%89:;<=2 0 ,>./?@4X (4x-6) =5X (3x- 1 ) , ABCD\r>./?@16x-24=15x-5 , ./%89:;FA15x,>./?@x - 24= - 5 , ./%89:;\rE=24I?p\r?\nK (1) 2-2x+l J + x\r3 2\r(2 - 2 x + l) X 6= J^-X 6\r3 2\r12 - 2X (2x+l) =3X (l+x)\r20 / 20
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