十字相乘法习题
2221.x,3x,2 2.x,6x,5 3.x,12x,11 2x,18x,174.
222x,4x,3x,4x,3x,2x,35. 6. 7. 2x,2x,38.
222x,7x,6x,5x,6x,x,69. 10. 11. 2x,x,612.
2424225,26a,ax,x,20x,6x,813. 14. 15. 16. 42 xx,,718
222222x,3xy,2ya,9ab,14bax,7ax,817. 18. 19.
22mn,3mn,1020.
22232y,13yb,36b,a,10a,9,a,4a,12a21. 22. 23. 24. 2222xy,5xy,6x
22(a,b),4(a,b)x,3(x,2y),3(x,2y),1025. 26. 27. 222 (x,4x),7(x,4x),12
22222(x,3),4x(x,5x,3)(x,5x,2),628. 29. (x,1)(x,2)(x,3)(x,4),2430.