12⁹ 2¹⁸ * 3⁹
---------- = ----------------- =2³ *3²=8*9=72
2¹⁵ *3⁷ 2¹⁵ *3⁷
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12⁶ 40⁵ 3⁶ *2¹² *5⁵*2¹⁵ 3⁶ *2²⁷ *5⁵
---------- * ------------ = ------------------------ = ------------------------ =2*5/3⁴=10/81
4⁹ *9⁵ 2⁸*5⁴ 2¹⁸ *3¹⁰ *2⁸ *5⁴ 2²⁶ *3¹⁰ *5⁴
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15*3¹³ +4*27⁵ 5*3¹⁴ +4*3¹⁵ 3¹⁴(5+4*3) 17*3¹⁴
--------------------- = --------------------- = ------------------ = ------------ =1
17*9⁷ 17*3¹⁴ 17*3¹⁴ 17*3¹⁴
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((1/7)⁻² -40*(5/3)°):9⁻²=(49-40*1): 1/81=9/81= 1/9