\(45\times1+45\times2+45\times3+45\times4+45\times5+45\times15+45\times20+45\times50\)

\(=45\times\left(1+2+3+4+5+15+20+50\right)\)

\(=45\times100\)

\(=4500\)

kết quả bằng : 4500 chac chan minh tinh bang may tinh ma 

chúc bạn học giỏi 

\(\left(1+3+5+7+....+97\right)\cdot\left(45\cdot3-45\cdot2-45\right)\)

\(=\left(1+3+5+7+....+97\right)\cdot\left[45\cdot\left(3-2-1\right)\right]\)

\(=\left(1+3+5+7+....+97\right)\cdot\left(45\cdot0\right)\)

\(=\left(1+3+5+7+....+97\right).0\)

\(=0\)

\(\approx GOOD\)\(LUCK\approx\)

A = \(\dfrac{1}{45}\) + \(\dfrac{2}{45}\) + \(\dfrac{3}{45}\)+...+ \(\dfrac{9}{45}\)

A = \(\dfrac{1+2+3+...+9}{45}\)

A =  \(\dfrac{\left(1+9\right)\times9:2}{45}\)

A = \(\dfrac{45}{45}\)

A =1

trả lời đầy đủ ra nhé các bn !

=[(99-1):2+1]x(99+1)x[45x(3-2-1)]

=(50x100)x(45x0)

=5000x0

=0

=0 nha bn

năm hok mới mk chúc bn hok tốt 

Đề:..........

= 9. 11/45 + 9. 4/45

= 9. (11/45 + 4/45)

= 9. 15/45

= 9. 1/3

= 3

3^3*11/45+3^3*4/45

=3^3*(11/45+4/45)

=3^3*1/3

=27*1/3

=27/3

=9

\(3^3\cdot\frac{11}{45}+3^3\cdot\frac{4}{45}\)

\(=27\left(\frac{11}{45}+\frac{4}{45}\right)\)

\(=27\cdot\frac{1}{3}\)

\(=9\)

( 1 + 2 + 3 + 3 + ... + 97 + 98 ) x ( 45 x 3 - 45 x 2 - 45 )

= ( 1 + 2 + 3 + 3 + ... + 97 + 98 ) x 0 (mik làm tắt phần này bạn tự làm)

= 0

(1 + 2 + 3 + 3 + ... + 97 + 98) x (45 x 3 - 45 x 2 - 45)

= (1 + 2 + 3 + 3 + ... + 97 + 98) x [45 x (3 - 2 - 1)]

= (1 + 2 + 3 + 3 + ... + 97 + 98) x (45 x 0)

= (1 + 2 + 3 + 3 + ... + 97 + 98) x 0

= 0.

3 x 45 + 2 x 45 + 4 x 45  + 45

= 3 x 45 + 2 x 45 + 4 x 45 + 45 x 1

= (3 + 2 + 4 + 1) x 45

= 10 x 45

= 450

3 x 45 + 2 x 45 + 4 x 45 + 45

= (3 +  2 + 4 + 1) x 45

= 10 x 45

= 450

=3 x 45 + 2 x 45 + 4 x 45 + 45 x 1

=45 x ( 3 + 2+ 4 + 1 )

=45 x 10

=450