本课配套习题挑战模式1/5
Rt△ABC中,CD是斜边AB上的高,DE⊥AC于E,AC:CB=5:4,则AE:EC=( )
A: 25:16 |
B: 5:4 |
C: 5:2 |
D: 以上都不对 |
- 提示1:PHA+5Yip55So5bey55+l55qE55u06KeS5ZKM5YWs5YWx6KeS77yM5Y+v6K+B5Zu+5Lit5omA5pyJ5LiJ6KeS5b2i6YO955u45Ly877yM5YaN5Yip55So5q+U5L6L57q/5q6177yM5Y2z5Y+v5rGC5Ye6QUXvvJpFQzwvcD4=
- 答案:QQ==
PGRpdj7op6PnrZTvvJrlnKhSdOKWs0FCQ+S4re+8jENE4oqlQULvvIxEReKKpUFD77yMPGJyPuKItOKWs0FEReKIveKWs0RDReKIveKWs0FDROKIveKWs0NCROKIveKWs0FCQ++8jDxicj7iiLRBRe+8mkVDPUFE77yaRELvvIxBQzxzdXA+Mjwvc3VwPj1BROKAokFC77yMQkM8c3VwPjI8L3N1cD49RELigKJBQu+8jDxicj7iiLRBRe+8mkVDPUFE77yaREI9QUM8c3VwPjI8L3N1cD7vvJpCQzxzdXA+Mjwvc3VwPj0yNe+8mjE2Ljxicj7mlYXpgIlBLjwvZGl2Pg==
本课配套习题挑战模式2/5
如图,在△ABC中,∠ACB=90°,CD⊥AB,垂足为D,下列结论不正确的是( )
A: ∠ACD=∠B |
B: CD·AB=AC·BD |
C: CD2=BD·AD |
D: CB2=BD·AB |
- 提示1:PHA+5qC55o2u55u45Ly85Y+v5b6XQeOAgUPjgIFE5q2j56Gu77yMQuS4jeato+ehrjwvcD4=
- 答案:Qg==
PGRpdj7op6PvvJrmoLnmja7nm7jkvLzlj6/lvpdB44CBQ+OAgUTmraPnoa7vvIxC5LiN5q2j56GuPC9kaXY+
本课配套习题挑战模式3/5
在Rt△ABC中,∠C=90°,CD⊥AB于D,下列等式中错误的是( )
A: AD•BD=CD2 |
B: AC•BD=CB•AD |
C: AC2=AD•AB |
D: AB2=AC2+BC2 |
- 提示1:PHA+55Sx55u45Ly85Y+v5b6XQeOAgUPmraPnoa7vvIznlLHli77ogqHlrprnkIblj6/lvpdE5q2j56GuPC9wPg==
- 答案:Qg==
PGRpdj7op6PvvJrnlLHnm7jkvLzlj6/lvpdB44CBQ+ato+ehru+8jOeUseWLvuiCoeWumueQhuWPr+W+l0TmraPnoa48L2Rpdj4=
本课配套习题挑战模式4/5
如图,在Rt△ABC,∠BAC=90°,AD⊥BC,AB=10,BD=6,则BC的值为( )
A: |
B: 2 |
C: |
D: |
- 提示1:PHA+5qC55o2u5bCE5b2x5a6a55CG5q+P5LiA5p2h55u06KeS6L655piv6L+Z5p2h55u06KeS6L655Zyo5pac6L655LiK55qE5bCE5b2x5ZKM5pac6L6555qE5q+U5L6L5Lit6aG55Y2z5Y+v5b6X5Ye6QkPnmoTplb8uPC9wPg==
- 答案:RA==
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
本课配套习题挑战模式5/5
已知:如图,△ABC中,AD⊥BC于D,下列条件:(1)∠B+∠DAC=90°;
(2)∠B=∠DAC;(3)CDAD =ACAB (4)AB2=BD·BC. 其中一定能够判定△ABC是直角三角形的有()个
A: 0 |
B: 1 |
C: 2 |
D: 3 |
- 提示1:PHA+5qC55o2u5bey55+l5a+55ZCE5Liq5p2h5Lu26L+b6KGM5YiG5p6Q77yM5LuO6ICM5b6X5Yiw562U5qGILjwvcD4=
- 答案:RA==
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