Page 24 - aljaber

@ @QQ@ @†a‡Èÿa@ @

3 1 − 2 4 = 10 − 18 = 7 ×10 − 3 ×18 ()
3 7 3 7 7×3 3×7
= 70 − 54 = 70 − 54 = 16 ()
21 21 21 21

7 − 2 1 = 7 − 11 = 5 × 7 − 11
5 1 5 5×1 5
= 35 − 11 = 35 − 11 = 24 = 4 4
55 5 5 5

:c a
b
d
a × c = ac
b d bd

.

a ÷ c = a × d = ad
b d b c bc

.

: ()
21×3 ()
3×7×2 ( ) 41 ÷21 ( )  3 1 2 ( )
5 2 48
33
3

7

2 1 × 3 = 9 × 3 = 9 × 3 = 27 ()
4 8 4 8 4 × 8 32 ()

 3 1 2 = 31×31 = 7×7 = 7×7 = 49 = 12 1
2 22 22 2×2 4 4