য়ােগ : 66. যদি (4a+5b) (4c5d) = (4a5b) (4c+5d) হয়, প্রমাণ।
ছে। [নিজে করি]।
কষে দেখি 5.3
a:b = c:d হলে, দেখাই যে,
(i) (a2+b2):(a2-b2) = (ac+bd): (ac-bd)
(ii) (a2+ab+b2):(a2ab+b2) = (c2+cd+d2): (c2-cd+d2)
(iii) / a+c :/b+d = (pa+qc): (pb+qd)
tarApna dukaan Uttarpara n
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