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BỘ ĐỀ THI THỬ THPTQG NĂM 2018 - MÔN TOÁN - MẪN NGỌC QUANG (ĐỀ 1-15) - CÓ LỜI GIẢI CHI TIẾT

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x<br />

a<br />

a x a x 2 <br />

a<br />

3<br />

2 2<br />

2 x <br />

a 2a<br />

SH HJ a <br />

3 3<br />

Câu 29: Đáp án A.<br />

x a<br />

3<br />

1 1 2a<br />

2 2a<br />

V SH. SABCD<br />

. . a <br />

3 3 3 9<br />

3<br />

ấ ấ MN / / BC, SM SN<br />

ừ<br />

â<br />

ế<br />

ABCNM.<br />

BC 2a 2a<br />

3<br />

OA R <br />

0<br />

2sin A 2sin120 3<br />

Câu 30: Đáp án D.<br />

<br />

ơ<br />

<br />

m <br />

C â<br />

3 2<br />

y x 3x â<br />

ẽ<br />

4<br />

m 0<br />

Câu 31: Đáp án A.<br />

3 2<br />

x 3x m 0<br />

â<br />

y<br />

m<br />

3 2<br />

y x 3x<br />

V i m i x và m i s ơ th ơ<br />

C x C x ... ( 1) C x ( C C x ... ( 1) C ) x (1 x)<br />

x<br />

0 1 2 n n n1 0 1<br />

n n n<br />

n n n n n n<br />

1 1<br />

n<br />

0 1 2 n n n1<br />

n 1 1 ( 1)<br />

Suy ra Cn x Cnx ... ( 1) Cn<br />

x dx (1 x)<br />

xdx Hay C x C ... C<br />

2 3 n 2<br />

0 0<br />

1 1<br />

n<br />

n 1<br />

(1 x) dx (1 x) dx<br />

<br />

<br />

<br />

ừ<br />

0 0<br />

1 1<br />

( n 1)(n 2) <strong>15</strong>6<br />

1 1 1<br />

1 2 <br />

, v i m i n *<br />

n n ( n 1)( n 2)<br />

3 <strong>15</strong>4 0 11( vì n *)<br />

2<br />

n n n <br />

0 1<br />

n<br />

n n n

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