Solve this:

19. Simplify and write in exponential form:

( a )   ( 3 5 ÷ 3 9 )   ×   3 - 6 ( b )   ( - 5 ) - 3   ×   ( - 5 ) - 3   ×   4 - 3 ( c )   25   ×   3 - 2 5 4     ×   3 4   ×   3 3

Dear student
(a) 35÷39×3-6= 35÷39×136=35×139×136=35×1315=1310=3-10(b) -5-3×-5-3×4-3=-5-3+-3×4-3=-5-3-3×4-3=-5-6×4-3 (c) 25×3-254×34×33=52×5-4×3-2×33×3-4=52+-4×3-2+3+-4=5-2×3-2+3-4=5-2×3-3Identity used:1) a-n=1an2) an×am=am+n3) anam=an-m
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