Toán Lớp 8: 54^2-36^2 tinh nhanh
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Toán Lớp 8: 54^2-36^2 tinh nhanh
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Comments ( 2 )
Giải đáp:
54^2 – 36^2
= ( 54 -36)( 54 + 36)
= 18 . 90
= 1620
Áp dụng: A^2 – B^2 = ( A – B)( A + B)
$\\$
54^2 – 36^2
= ( 9 . 6)^2 – ( 6 .6)^2
= 9^2 . 6^2 – 6^2 .6^2
= ( 9^2 – 6^2) .6^2
= 45 . 36
= 1620
Giải đáp:
54^(2)-36^2
=(54-36).(54+36)
=18.90
=1620
Áp dụng HĐT số 2 : a^(2)-b^2=(a-b)(a+b)