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22.3
Nona Bogan
Lvl 10
∙ 3y agoThis answer is:
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Wiki User
∙ 10y agoThere are several ways and here's one, with a lot of detail that can generally be taken for granted:
2.3 = 3.0 - 0.7 = 3 - 0.7
so
20 - 2.3 = 20 - (3 - 0.7) = 20 - 3 + 0.7 = 17 + 0.7 = 17.7 .. .. .. .. .. (*)
So
2.3 - 20 = -(20 - 2.3) = -(*) = -17.7
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