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b)(0,3a)²-(0,5b)²= 0,09a²-0,25b²
c)(0,1p)²-(2,3q)²=0,01p²-5,29q²
d)(2,8x)²-(1,1y)²=7,84x²-1,21y²
e)(2/3r)²-(1/4s)²=4/9r²-1/16s²
f)(1 1/2k)²-(1/3m)²=2 1/4k² -1/9m²
Prosze :)