下列各式中,計算正確的是( )
( - 4 ) ( - 16 ) = - 4 × - 16 = ( - 2 ) × ( - 4 ) = 8 |
8 a 2 = 4 a |
41 2 - 40 2 = ( 41 + 40 ) ( 41 - 40 ) = 9 |
3 2 + 4 2 = 3 + 4 = 7 |
【考點】二次根式的性質與化簡.
【答案】C
【解答】
【點評】
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發布:2024/7/25 8:0:9組卷:159引用:5難度:0.9
( - 4 ) ( - 16 ) = - 4 × - 16 = ( - 2 ) × ( - 4 ) = 8 |
8 a 2 = 4 a |
41 2 - 40 2 = ( 41 + 40 ) ( 41 - 40 ) = 9 |
3 2 + 4 2 = 3 + 4 = 7 |