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演習:
The expression a[b+(c-d)] is equivalent to:
A. ab + ac - ad
B. ab + ac + ad
C. ab + ac - d
D. ab + c + d
E. ab + c - d
剖析:The correct answer is A. To find an equivalent expression, multiply a by b+c-d. This results in a(b) + a(c) + a(-d), or ab + ac - ad.
準確謎底選A。依據乘法分派率睜開括號可得ab + ac - ad。