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歡迎您訪問數(shù)學(xué)考題練習(xí):的整數(shù)部分是a,小數(shù)部分是b,求-a2+|b2!

數(shù)學(xué)考題練習(xí):的整數(shù)部分是a,小數(shù)部分是b,求-a2+|b2

更新時(shí)間:2024-01-12 14:08:06作者:貝語網(wǎng)校

的整數(shù)部分是a,小數(shù)部分是b,求-a2+|b2-1|-2ab的值.

試題答案

解:∵16<17<25,

∴4<<5,

∴a=4,b=-4,

∴-a2+|b2-1|-2ab,

=-16+|32-8|-8(-4),

=-16.

故答案為:-16.

試題解析

只需首先對(duì)估算出大小,從而求出其整數(shù)部分a,再進(jìn)一步表示出其小數(shù)部分b;然后將其代入所求的代數(shù)式求值.

點(diǎn)評(píng):本題考查了估算無理數(shù)的大小、代數(shù)式求值.解答此題的關(guān)鍵是利用“夾逼法”求得a、b的值.

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