问题
解答题
计算:求当a=5,b=
|
答案
[(ab+1)(ab-1)-2a2b2+1]÷ab,
=(a2b2-1-2a2b2)÷ab,
=-a2b2÷ab,
=-ab,
当a=5,b=
时,原式=-5×7 15
=-7 15
.7 3
计算:求当a=5,b=
|
[(ab+1)(ab-1)-2a2b2+1]÷ab,
=(a2b2-1-2a2b2)÷ab,
=-a2b2÷ab,
=-ab,
当a=5,b=
时,原式=-5×7 15
=-7 15
.7 3