Ӣҽ̾W > ДW > }ĿԔ

}ĿώُIbWһͯӕNЦĘ͐ăɷNɷNărͬͬһNĚrͬڕҪُI˵ÿ4ÿrDʾ
1ЦĘĆ΃rxԪՈúxĴʽʾڢڢĿrҪ󻯺ڈDУ
2ڢĿrXȵڢĿrX2Ԫ@ɷNĚĆ΃r

𰸡
1⣺ЦĘĆ΃rxԪtĚĆ΃rǣ143xԪ}

ڢĿrǣx+3143x=x+429x=428xԪ

ڢĿrǣ2x+2143x=2x+286x=284xԪ


2⣺}428x=284x2

x=4

143x=2

ЦĘĆ΃r4ԪĚĆ΃r2Ԫ


1ЦĘĆ΃rxԪɵڢĿrX14ԪóĚĆ΃rǣ143xԪÿĿrX=ЦĘărX+ĚărXڢڢĿr2ڢĿrXȵڢĿrX2Ԫг̼ⷽɣ

ϵд
P}

ĿДW Դ

}Ŀȥ̖_()

A. x2-(3x-2)=x2-3x-2

B. 7a+(5b-1)=7a+5b+1

C. 2m2-(3m+5)=2m2-3m-5

D. -(a-b)+(ab-1)=a-b+ab-1

鿴𰸺ͽ>>

ĿДW Դ

}ĿDOİ돽ODABcCBYAOLOcEBYECAB=8CD=2ECL

鿴𰸺ͽ>>

ĿДW Դ

}Ŀ֪ABCA=50

1DABCACBĽƽ־cOtBOC=

2DABCACBȷ־քeO1O2tBO2C=

3DABCACBnȷ־քeO1O2On1Ȳn1cBOn1CnĴʽʾ

4D֪ABCACBnȷ־քeO1O2On1BOn1C=60nֵ

鿴𰸺ͽ>>

ĿДW Դ

}Ŀijξc·ݹӴο25f˴·ݹӴο64f˴OÿµƽLʞxtз̞飨
A.251+x2=64
B.25+251+x2=64
C.251+2x=64
D.641x2=25

鿴𰸺ͽ>>

ĿДW Դ

}ĿиMܽMεǣ

A. 2cm3cm5cm B. 5cm6cm10cm

C. 1cm1cm3cm D. 3cm4cm8cm

鿴𰸺ͽ>>

ĿДW Դ

}ĿD1cOֱABһc^cO侀OCʹBOC=120㣬һ30ȽǵֱǰֱccO̎һ߅OM侀OBϣһ߅ONֱAB·DСOMN=30NOM=90㣩
1D1еǰ@cOrDD2ʹOMڡBOCăȲǡƽ֡BOCֱONǷƽ֡AOCՈf
2D1еǰ@cOÿ6ٶrᘷDһD^trֱONǡƽJǡAOCt
3D1еǰ@cO형rDD3ʹONڡAOCăȲՈ̽AOMcNOC֮gĔPϵfɣ

鿴𰸺ͽ>>

ĿДW Դ

}Ŀ֪4y2+my+1ȫƽʽtmֵ_________

鿴𰸺ͽ>>

ĿДW Դ

}ĿijlIaмg15a˺ƶaƷÿa~yӋ@15ijµļӹ

ÿ˼ӹ

540

450

300

240

210

120

˔

1

1

2

6

3

2

(1)@15ԓ¼ӹƽλͱ

(2)aؓ؟˰ÿλ˵¼ӹ260J@~Ƿʲô

鿴𰸺ͽ>>

ͬԴ
久久精品免费一区二区视