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֧һ-вģ(6.3)

2019-06-05 15:27:23| й

йΪṩʡ֧һƸϢϡ˽Ѷ밲ʡ֧һƸѧϰQQȺעй΢ţahoffcn, ʱز鿴пѶ

 

1.СAصBأAB4600ףʼÿСʱ20ǧ׵ٶʻ;гֹϣάʱ6ӡΪҪԭƻʱ䵽Bأ޺óԺÿСʱ45ǧ׵ٶʻھA( )Զֹϵġ

A.600 B.800 C.1000 D.1200

2.AB400ף8СܺͬʱAسABؼСÿ200ףÿ80ס811֣С֮ܺľǶ?

A.0 B.80 C.120 D.200

3.ס·߳1880ǧףӼ׵صҵؿһÿСʱʻ160ǧף3Сʱ󣬴ҵص׵ؿһ4Сʱ붯ÿСʱʻ( )

A.180ǧ B.190ǧ C.200ǧ D.210ǧ

4.ijɭԴٶһģҲܵȻֺԭӰ졣ôÿ꿪110ףɿ90꣬ÿ꿪90ɿ210ꡣΪʹƬɭֿɳÿ࿪ɶľ?

A.30 B.50 C.60 D.75

1.𰸡Cй޺óԺ·һģٶȺʱɷȹϵVԭV=2045=49TԭTʵ=945=6=1/10Сʱ1=1/50СʱTԭ=9=9/50СʱԳֹʱB20×(9/50)=18/5=3.6ǧ=3600ףA4600-3600=1000ס

2.𰸡Cй11ӣС200×11=2200=5×400+20080×11=880=4×200+80Сܺ200-80=120ס

3.𰸡Bйʻ4Сʱʻ4+3=7СʱٶΪ(1880-160×7)÷4=(1880-1120)÷4=760÷4=190(ǧ/Сʱ)

4.𰸡DйԭԴΪSԴٶΪVS=90×(110-V)=210×(90-V)V=75S=3150ÿ࿪75ľ

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