(a+b)²=100 ab=16 a²-b²=?
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(a+b)²=100 ab=16 a²-b²=?
(a+b)²=100 ab=16 a²-b²=?
(a+b)²=100 ab=16 a²-b²=?
(a+b)²=100
a^2+2ab+b^2=100
a^2+b^2=100-2*16=68
a^2-2ab+b^2=68-2*16=36
(a-b)^2=36
(a+b)²(a-b)^2=3600
(a²-b²)^2=3600
a²-b²=正负60
(a+b)²=100, ab=16
(a-b)²=(a+b)²-4ab=100-4x16=36
[(a+b)(a-b)]²=3600
(a+b)(a-b)=±60
a²-b²=(a+b)(a-b) =±60
(a+b)²=100 ,a+b=10
(a+b)²=a²+b²+2ab+(2ab-2ab)=a²-2ab+b²+4ab=(a-b)²)+4ab=(a-b)²)+4*16=(a-b)²)+64
(a-b)²)+64=100, (a-b)²=36,a-b=6
(a+b)(a-b)=10*6=60