十字相乘法练习题(含答案)适合打印

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乘法,练习题,十字,答案,适合



十字相乘法习题(1)

班级 姓名

x2 3x 2=0 x2 6x 5=0 x2 12x 11=0 x2 18x 17=0

x+1(x+5)=0 解:x+1(x+17)=0 x+1(x+11)=0 解:解:x+1(x+2)=0 解:

x+1=0x+5=0 x+1=0x+17=0 x+1=0x+11=0 x+1=0x+2=0

x1= 1x2= 5 x1= 1x2= 11 x1= 1x2= 17 x1= 1x2= 2

x2 8x 7=0 x2 6x 7=0 x2 6x 7=0 x2 8x 7=0

x1(x+7)=0 解:x+1(x7)=0 解:x1(x7)=0 解:x+1(x+7)=0 解:

x1=0x+7=0 x+1=0x7=0 x1=0x7=0 x+1=0x+7=0

x1= 1x2= 7 x1= 1x2= 7 x1= 1x2= 7 x1=1x2= 7

x2 5x 6=0 x2 5x 6=0 x2 x 6=0 x2 x 6=0

x+2(x3)=0 解:x+2(x+3)=0 解:x2(x3)=0 解:x2(x+3)=0 解:

x+2=0x3=0 x2=0x3=0 x2=0x+3=0 x+2=0x+3=0

x1= 2x2= 3 x1= 2x2= 3 x1= 2x2= 3 x1= 2x2= 3 x2 2x 15=0 x2 2x 15=0 x2 8x 15=0 x2 8x 15=0

解:x3(x+5)=0 解:x3(x5)=0 x+3(x+5)=0 解:x+3(x5)=0 解:

x3=0x5=0 x+3=0x+5=0 x+3=0x5=0 x3=0x+5=0

x1= 3x2= 5 x1= 3x2= 5 x1= 3x2= 5 x1= 3x2= 5 x2 23x 22=0 x2 23x 22=0 x2 9x 22=0 x2 9x 22=0

x1(x22)=0 解:x2(x+11)=0 解:x+2(x11)=0 解:x+1(x+22)=0 解:

x1=0x22=0 x2=0x+11=0 x+2=0x11=0 x+1=0x+22=0

x1= 2x2= 11 x1= 2x2= 11 x1= 1x2= 22 x1= 1x2= 22 x2 13x 22=0 x2 13x 22=0 x2 21x 22=0 x2 21x 22=0 x+1(x22)=0 解:解:x+2(x+11)=0 解:x1(x+22)=0 x2(x11)=0 解:

x+1=0x22=0 x1=0x+22=0 x2=0x11=0 x+2=0x+11=0

x1= 1x2= 22 x1= 2x2= 11 x1= 2x2= 11 x1= 1x2= 22 x2 22x 121=0 x2 22x 121=0 x2 26x 169=0 x2 26x 169=0

x11(x11)=0 解:x13(x13)=0 解:x+13(x+13)=0 解:x+11(x+11)=0 解:

x11=0x11=0 x13=0x13=0 x+13=0x+13=0 x+11=0x+11=0

x1= 13x2= 13 x1= 13x2= 13 x1= 11x2= 11 x1= 11x2= 11

x2 7x 12=0 x2 7x 12=0 x2 x 12=0 x2 x 12=0 解:x+3(x+4)=0 解:x+3(x4)=0 x3(x+4)=0 解:x3(x4)=0 解:

x+3=0x4=0 x3=0x+4=0 x3=0x4=0 x+3=0x+4=0

x1= 3x2= 4 x1= 3x2= 4 x1= 3x2= 4 x1= 3x2= 4 x2 19x 18=0 x2 19x 18=0 x2 17x 18=0 x2 17x 18=0

x1(x+18)=0 解:x+1(x18)=0 x1(x18)=0 解:解:x+1(x+18)=0 解:

x1=0x+18=0 x+1=0x18=0 x1=0x18=0 x+1=0x+18=0

x1= 1x2= 18 x1= 1x2= 18 x1= 1x2= 18 x1= 1x2= 18

x2 9x 18=0 x2 9x 18=0 x2 3x 18=0 x2 3x 18=0

x3(x6)=0 解:x+3(x6)=0 x3(x+6)=0 解:解:x+3(x+6)=0 解:

x3=0x6=0 x+3=0x6=0 x3=0x+6=0 x+3=0x+6=0

x1= 3x2= 6 x1= 3x2= 6 x1= 3x2= 6 x1= 3x2= 6



1






十字相乘法习题(2)

班级 姓名

x2 12x 20=0 x2 x 20=0 x2 9x 20=0 x2 8x 20=0

x+4(x5)=0 解:x+4(x+5)=0 解:x+2(x10)=0 解:x+2(x+10)=0 解:

x+4=0x5=0 x+4=0x+5=0 x+2=0x10=0 x+2=0x+10=0

x1= 4x2= 5 x1= 2x2= 10 x1= 2x2= 10 x1= 4x2= 5

x2 21x 20=0 x2 21x 20=0 x2 19x 20=0 x2 19x 20=0

x1(x20)=0 解:x1(x+20)=0 解:x+1(x20)=0 解:x+1(x+20)=0 解:

x1=0x20=0 x1=0x+20=0 x+1=0x20=0 x+1=0x+20=0

x1= 1x2= 20 x1= 1x2= 20 x1= 1x2= 20 x1= 1x2= 20

2x2 3x 1=0 5x2 6x 1=0 11x2 12x 1=0 17x2 18x 1=0 解:x+1(2x+1)=0 解:x+1(5x+1)=0 解:x+1(11x+1)=0 解:x+1(17x+1)=0

x+1=05x+1=0 x+1=011x+1=0 x+1=017x+1=0 x+1=02x+1=0 1111

x1= 1x2= x1= 1x2= x1= 1x2= x1= 1x2=

251117

12x2 13x 1=0 12x2 13x 1=0 12x2 11x 1=0 12x2 11x 1 =0

x1(12x+1)=0 x+1(12x1)=0 解:解:x+1(12x+1)=0 解:x1(12x1)=0 解:

x1=012x+1=0 x+1=012x1=0 x1=012x1=0 x+1=012x+1=0 1111

x1= 1x2= x1= 1x2= 12 x1= 1x2= x1= 1x2= 121212222

12x 8x 1=0 12x 8x 1=0 12x 4x 1=0 12x2 4x 1 =0

2x1(6x1)=0 解:2x+1(6x1)=0 解:2x1(6x+1)=0 解:2x+1(6x+1)=0 解:

2x1=06x1=0 2x+1=06x1=0 2x1=06x+1=0 6x+1=0 2x+1=011111111

x= x= x1= x2= x1= x2= 12x1= x2= 262626262222

12x 7x 1=0 12x 7x 1=0 12x x 1=0 12x x 1 =0

3x1(4x1)=0 解:3x+1(4x1)=0 解:3x1(4x+1)=0 解:3x+1(4x+1)=0 解:

3x1=04x1=0 3x+1=04x1=0 3x1=04x+1=0 4x+1=0 3x+1=011111111

x1= x2= x1= x2= x1= x2= x1= 3 x2= 4 3434342222

2x 13x 15=0 2x 13x 15=0 2x 7x 15=0 2x 7x 15=0 解:x+5(2x+3)=0 解:x5(2x3)=0 解:x+5(2x3)=0 解:x5(2x+3)=0

x5=02x3=0 x+5=02x3=0 x5=02x+3=0 x+5=02x+3=0 3333

x1= 5x2= x1= 5x2= x1= 5x2= x1= 5x2= 22222x2 11x 15=0 4x 2+4x 15=0 2x2 x 15=0 2x2 x 15=0

x+3(2x5)=0 解:2x3(2x+5)=0 解:x3(2x+5)=0 解:x+3(2x+5)=0 解:

x+3=02x5=0 2x3=02x+5=0 x3=02x+5=0 x+3=02x+5=0 53555

x= 3x= x1= 3x2= 12x1= 3x2= x1=2 x2= 2 22222 22

8x+6x35=0 18x21x+5=0 209x20x=0 6x11x+3=0 解:2x+5(4x7)=0 解:3x1(6x5)=0 解:54x(4+5x)=0 解:2x3(3x1)=0

4x7=0 3x1=06x5=0 54x =04+5x =0 2x3=03x1=0 2x+5=057155431

x1= x2= x1= x2= x= x= 12x= x= 12243645232(x+y) 2+( x+y)( xy)6(xy) 2=0 7(x1) 2+4(x1)20=0

解:[(x1)+ 2][ 7(x1) 10]=0 解:[(x+y)+ 2(xy)][ 2(x+y) 3(xy)]=0

即(x+1(7x17)=0 3x(x +5y) =0

(x+y) (xy) x+1=07x17 =0 注:把(xy)看作 3x=0x +5y =0 注:

看作一个整体 一个整体 17x1= 0x2= 5y x1= 1x2=

7

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