若a²-8ab+16b²=0,且b=2.5,则a=;
a²-8ab+16b²=0
(a-4b)²=0
∴a=4b
∵b=2.5
∴a=10
n²/9-2/3n+1=;
=(n/3-1)²
a²/25+b²/16-ab/10=;
=(a/5)²-2×a/5×b/4+(b/4)²
=(a/5-b/4)²
a的4次方b的4次方+4a²b²c+4c²=;
=(a²b²+2c)²
若a²-8ab+16b²=0,且b=2.5,则a=;
a²-8ab+16b²=0
(a-4b)²=0
∴a=4b
∵b=2.5
∴a=10
n²/9-2/3n+1=;
=(n/3-1)²
a²/25+b²/16-ab/10=;
=(a/5)²-2×a/5×b/4+(b/4)²
=(a/5-b/4)²
a的4次方b的4次方+4a²b²c+4c²=;
=(a²b²+2c)²