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急救!NO1.2x^2+2x+1/2NO2.(x+1)(x+2)+1/4NO3.25^7-5^12
题目详情
急救!
NO1.2x^2+2x+1/2
NO2.(x+1)(x+2)+1/4
NO3.25^7-5^12
NO1.2x^2+2x+1/2
NO2.(x+1)(x+2)+1/4
NO3.25^7-5^12
▼优质解答
答案和解析
2x^2+2x+1/2=2(x^2+x+1/4)=2(x+1/2)^2
(x+1)(x+2)+1/4 =x^2+3x+2+1/4=x^2+3x+9/4
=(x+3/2)^2
25^7-5^12=(5^2)^7-5^12=5^14-5^12=5^12(5^2-1)
=24*5^12
(x+1)(x+2)+1/4 =x^2+3x+2+1/4=x^2+3x+9/4
=(x+3/2)^2
25^7-5^12=(5^2)^7-5^12=5^14-5^12=5^12(5^2-1)
=24*5^12
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