2.(30)
( 120)
3.( 1. 10.2.5)
( 1:2=5: 10)
(2.5)
( 10)4.(4)
(24)
(96)5.(3)(4 1)
( 1) ( 123) 6.( 120) 7.( 1)(x)(2)(√)(3)(x)(4)(√)(5)(√)8。 A quadrilateral with right angles must be a square. )9. 100=3+97
100= 1 1+89
100= 17+83
100=29+7 1
100=4 1+59
100=47+53
A: I can write six kinds.