计算下列各题:a)Error parsing MathML: error on line 1 at column 55: xmlns: 'http://www.w3.org/1998/Math/MathML"' is not a valid URIb)[4-1-6-1]-2c)(1113)3×3×(1113)-2"
解答
a)(19)−1−39−2
= 9−3×92
= 9−3×81=9−243=−234
b) [4−1−6−1]−2
=14−(16)2
=(112)−2
= 122
= 12 × 12 = 144
c) (1113)3×13×(1113)−2
= (1113)3−2×13
= (1113)1×13
= 11
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