=∴x1=3,x2=∴x1=3,x2=∴x1=3,x2=34444213x15=02x213x15=02x27x15=02x27x15=02x解:(x+5)(2x+3)=0解:(x5)(2x3)=0解:(x+5)(2x3)=0解:(x5)(2x+3)=0x+5=0或2x+3=0x5=0或2x3=0x+5=0或2x3=0x5=0或2x+3=03333∴x1=5,x2=∴x1=5,x2=∴x1=5,x2=∴x1=5,x2=2222211x15=04x2+4x15=02x2x15=02x2x15=02x解:(x+3)(2x+5)=0解:(2x3)(2x+5)=0解:(x+3)(2x5)=0解:(x3)(2x+5)=0x+3=0或2x5=0x+3=0或2x+5=02x3=0或2x+5=0x3=0或2x+5=035555∴x1=2=∴x1=3,x2=∴x1=3,x2=∴x1=3,x2=2,x22228x2+6x-35=018x2-21x+5=020-9x-20x2=06x2-11x+3=0解:(2x+5)(4x7)=0解:(3x1)(6x5)=0解:(54x)(4+5x)=0解:(2x3)(3x1)=02x+5=0或4x7=03x1=0或6x5=054x=0或4+5x=02x3=0或3x1=057155431∴x1=,x2=∴x1=,x2=∴x1=,x2=∴x1=2=2,x24364532(x+y)2+(x+y)(x-y)-6(x-y)2=07(x-1)2+4(x-1)-20=0解:[(x1)+2][7(x1)10]=0解:[(x+y)+2(xy)][2(x+y)3(xy)]=0即3x(x+5y)=03x=0或x+5y=0∴x1=0,x2=5y注:把(x+y)、(xy)看作一个整体即(x+1)(7x17)=0x+1=0或7x17=017∴x1=1,x2=7注:把(xy)看作一个整体2
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