Toán Lớp 8: chứng minh: (10a + 5)² = 100a . (a + 1) + 25
Leave a reply
Register Now
Login
Lost Password
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Toán Lớp 8: chứng minh: (10a + 5)² = 100a . (a + 1) + 25
Comments ( 2 )
=(10a + 5)(10a + 5)
=10a (10a + 5)+5(10a + 5)
=100a^2+50a+50a+25
=100a^2+100a+25
=100a(a+1)+25(đpcm)