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歡迎您訪問數(shù)學(xué)考題練習(xí):元旦節(jié)班上數(shù)學(xué)興趣小組的同學(xué),互贈新年賀卡,每!

數(shù)學(xué)考題練習(xí):元旦節(jié)班上數(shù)學(xué)興趣小組的同學(xué),互贈新年賀卡,每

更新時(shí)間:2024-01-12 16:34:03作者:貝語網(wǎng)校

元旦節(jié)班上數(shù)學(xué)興趣小組的同學(xué),互贈新年賀卡,每兩個(gè)同學(xué)都相互贈送一張,小明統(tǒng)計(jì)出全組共互送了90張賀年卡,那么數(shù)學(xué)興趣小組的人數(shù)是多少設(shè)數(shù)學(xué)興趣小組人數(shù)為x人,則可列方程為

A.x(x-1)=90

B.x(x-1)=2×90

C.x(x-1)=90÷2

D.x(x+1)=90

試題答案

A

試題解析

如果設(shè)數(shù)學(xué)興趣小組人數(shù)為x人,每名學(xué)生送了(x-1)張,共有x人,則一共送了x(x-1)張,再根據(jù)“共互送了90張賀年卡”,可得出方程為x(x-1)=90.

解答:設(shè)數(shù)學(xué)興趣小組人數(shù)為x人,

每名學(xué)生送了(x-1)張,

共有x人,

根據(jù)“共互送了90張賀年卡”,

可得出方程為x(x-1)=90.

故選A.

點(diǎn)評:讀清題意,找準(zhǔn)數(shù)量關(guān)系,列出方程.

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