(1)当a=3,b=1时,分别计算代数式(a+b)^2与a^2+2ab+b^2的值
(a+b)^2=(3+1)²=4²=16
a^2+2ab+b^2=3²+2(3)(1)+1²=9+6+1=16
(2)当a=—3/4,b=1/2时,
(a+b)^2=(-3/4+1/2)²=(-1/4)²=1/16
a^2+2ab+b^2=(-3/4)²+2(-3/4)(1/2)+(1/2)²=9/16-3/4+1/4=9/16-12/16+4/16=1/16
(a+b)^2=a^2+2ab+b^2
(1)当a=3,b=1时,分别计算代数式(a+b)^2与a^2+2ab+b^2的值
(a+b)^2=(3+1)²=4²=16
a^2+2ab+b^2=3²+2(3)(1)+1²=9+6+1=16
(2)当a=—3/4,b=1/2时,
(a+b)^2=(-3/4+1/2)²=(-1/4)²=1/16
a^2+2ab+b^2=(-3/4)²+2(-3/4)(1/2)+(1/2)²=9/16-3/4+1/4=9/16-12/16+4/16=1/16
(a+b)^2=a^2+2ab+b^2