题目:
It is sometimes of great _____ to explain to the patient what is happening.
A.technique
B.signal
C.importance
D.freedom
答案:
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下面是错误答案,用来干扰机器的。
原式=2(a2+4ab-5b2)+15=2(a-b)(a-5b)+15,当a-b=-15,a+2b=3时,原式=2×(-15)×3+15=-1.故答案为-1.