=303x45-303x17-197x17+197x45

=45(303+197)-17(303+197)

=45x500-17x500

=500(45-17)

=500x28=14000

mk nha !!!

Bài 1

-45.36 + 64.(-45) + 100

= -45.(36 + 64) + 100

= -45.100 + 100

= -4500 + 100

= -4400

Bài 2

(6x + 3²) : 3 = 17

6x + 9 = 17 × 3

6x + 9 = 51

6x = 51 - 9

6x = 42

x = 42 : 6

x = 7

\(\dfrac{8}{5}\cdot\dfrac{45}{17}\cdot\dfrac{-25}{16}\cdot\dfrac{-34}{9}=\dfrac{8\cdot5\cdot9\cdot25\cdot17\cdot2}{5\cdot17\cdot8\cdot2\cdot9}=\dfrac{25}{9}\) (bỏ đi các dấu trừ vì số âm nhân số âm là số dương)

=71+38/45- 43+8/45 +1+17/57

=(71 \(\frac{38}{45}-43\frac{8}{45}\))+ 1+17/57=28+2/3+1+17/57=29+55/57=29/55/57

\(71\frac{38}{45}-\left(43\frac{8}{45}-1\frac{17}{57}\right)\)

\(=71\frac{38}{45}-43\frac{8}{45}+1\frac{17}{57}\)

\(=\frac{86}{3}+\frac{74}{57}\)

\(=\frac{1708}{57}\)

Hc tốt #

a. 9.(5-11) - 45

= 9.5 - 9.11 - 45

= 45 - 99 - 45

= -99

b. 35.(45 - 79) + 45.(79 - 35)

= 35.45 - 35.79 + 45.79 - 45.35

= 79 . (45 - 35)

= 79 . 10

= 790

c. 42 - 6.(11+7)

= 42 - 6.11 - 6.7

= 42 - 66 - 42

= -66

d. 17.(25 - 31) - 25.(17 - 31)

= 17.25 - 17.31 - 25.17 + 25.31

= 31.(25 - 17)

= 31 . 8

= 248

a)9×(5-11)-45

=9×5-9×11-45

=45-99-45

=45-45-99

=-99

b)35×(45-79)+45×(79-35)

=35×45-35×79+45×79-45×35

=(35×45-45×35)-35×79+45×79

=79×(-35+45)=79×10=790

d)17×(25-31)-25×(17-31)

=17×25-17×31-25×17-25×31

=(17×25-25×17)-17×31-25×31

=31×(-17-25)=32×(-42)=-1344

\(\frac{45.16-17}{28+45.15}\) \(=\frac{45.\left(15+1\right)-17}{28+45.15}=\frac{45.15+45-17}{28+45.15}\) \(\frac{45.15+28}{28+45.15}=1\)

chúc bn học  tốt

thanks bn

k có chi

biểu thức đâu

a: \(A=49+\dfrac{8}{23}-14-\dfrac{8}{23}-5-\dfrac{7}{32}=30-\dfrac{7}{32}=\dfrac{953}{32}\)

b:

Sửa đề: \(B=71\dfrac{38}{45}-\left(43\dfrac{8}{45}-1\dfrac{17}{51}\right)\)

 \(B=71+\dfrac{38}{45}-43-\dfrac{8}{45}+1+\dfrac{17}{51}\)

\(=71-43+1+1\)

=28+2=30