挑战习题
1
/5
单选题
难度:
1.如图,直线a、b被c所截,若a∥b,∠1=45°,∠2=65°,则∠3的度数为( )
A
110°
B
115°
C
120°
D
130°
提示1:
5qC55o2u5LiJ6KeS5b2i55qE5aSW6KeS5oCn6LSo5b6X5Yiw4oigMSviiKAyPeKIoDQ=
提示2:
5qC55o2u5bmz6KGM57q/55qE5oCn6LSo5b6X5Yiw4oigMz3iiKA0
正确答案:
QQ==
6Kej562U77ya5qC55o2u5LiJ6KeS5b2i55qE5aSW6KeS5oCn6LSo77yMPGJyPuKItOKIoDEr4oigMj3iiKA0PTExMMKw77yMPGJyPuKItWHiiKVi77yMPGJyPuKItOKIoDM94oigND0xMTDCsO+8jDxicj7mlYXpgInvvJpB77yO
2
/5
单选题
难度:
2.如图,在△ABC中,CD是∠ACB的平分线,∠A=80°,∠ACB=60°,那么∠BDC=( )
A
80°
B
90°
C
100°
D
110°
提示1:
5qC55o2u6KeS5bmz5YiG57q/55qE5oCn6LSo5YWI5rGC5Ye64oigRENB55qE5bqm5pWw
提示2:
5YaN5qC55o2u5LiJ6KeS5b2i5YaF6KeS5LiO5aSW6KeS55qE5YWz57O75rGC5Ye64oigQkRD55qE5bqm5pWw
正确答案:
RA==
6Kej562U77ya4oi1Q0TmmK/iiKBBQ0LnmoTlubPliIbnur/vvIziiKBBQ0I9NjDCsO+8jDxicj7iiLTiiKBBQ0Q9MzDCsO+8iOW5s+WIhue6v+eahOWumuS5ie+8ie+8jDxicj7iiLXiiKBBPTgwwrDvvIw8YnI+4oi04oigQkRDPTExMMKw77yI5LiJ6KeS5b2i55qE5LiA5Liq5aSW6KeS562J5LqO5LiO5a6D5LiN55u46YK755qE5Lik5Liq5YaF6KeS55qE5ZKM77yJ77yOPGJyPuaVhemAiUTvvI4=
3
/5
单选题
难度:
3.已知如图,△ABC为直角三角形,∠C=90°,若沿图中虚线剪去∠C,则∠1+∠2等于( )
A
315°
B
270°
C
180°
D
135°
提示1:
5Yip55So5LiJ6KeS5b2i5YaF6KeS5LiO5aSW6KeS55qE5YWz57O7
提示2:
5LiJ6KeS5b2i55qE5Lu75LiA5aSW6KeS562J5LqO5ZKM5a6D5LiN55u46YK755qE5Lik5Liq5YaF6KeS5LmL5ZKM
正确答案:
Qg==
PGltZyB3aWR0aD0xMzQgaGVpZ2h0PTEwNyBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzNCL0VCL3JCQUNKbFRDSVNyelpFZk1BQUFXbHM1MWtrNDkwMy5wbmciIGFsdD3pnZLmnpzlrabpmaI+PGJyPuino+etlO+8muKIteKIoDHjgIHiiKAy5piv4pazQ0RF55qE5aSW6KeS77yMIDxicj7iiLTiiKAxPeKIoDQr4oigQ++8jOKIoDI94oigMyviiKBD77yMPGJyPuWNs+KIoDEr4oigMj0y4oigQyvvvIjiiKAzK+KIoDTvvInvvIw8YnI+4oi14oigMyviiKA0PTE4MMKwLeKIoEM9OTDCsO+8jDxicj7iiLTiiKAxK+KIoDI9MsOXOTDCsCs5MMKwPTI3MMKw77yOPGJyPuaVhemAie+8mkLvvI4=
4
/5
单选题
难度:
4.如图,∠BDC=98°,∠C=38°,∠B=23°,∠A的度数是( )
A
61°
B
60°
C
37°
D
39°
提示1:
5L2c55u057q/QUQ=
提示2:
5qC55o2u5LiJ6KeS5b2i55qE5aSW6KeS5oCn6LSo
正确答案:
Qw==
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
5
/5
单选题
难度:
5.如图,点D,E在△ABC的边上,CD与BE相交于点F.则∠1,∠2,∠3,∠4应满足的关系是( )
A
∠1+∠4=∠2+∠3
B
∠1+∠2=∠3+∠4
C
∠1+∠2=∠4-∠3
D
∠2-∠1=∠3+∠4
提示1:
5qC55o2u5LiJ6KeS5b2i5aSW6KeS55qE5oCn6LSo5b6X5Ye64oigMyviiKA0PeKIoENFRg==
提示2:
4oigMSviiKBDRUY94oigMg==
正确答案:
RA==
6Kej562U77ya4oi14oigQ0VG5piv4pazQUJF55qE5aSW6KeS77yMPGJyPuKItOKIoDMr4oigND3iiKBDRUbvvIw8YnI+4oi14oigMuaYr+KWs0NFRueahOWkluinku+8jDxicj7iiLTiiKAxK+KIoENFRj3iiKAy77yM5Y2z4oigMi3iiKAxPeKIoENFRu+8jDxicj7iiLTiiKAyLeKIoDE94oigMyviiKA077yOPGJyPuaVhemAiUTvvI4=