a)32460;6500

b)585

d, 324600 ;6500

e, 585 

SO CHIA HET CHO3 LA 585,1248,32460

SO CHIA HET CHO 5 LA 585,1975,32460,6500

SO CHIA HET CHO 2 LA 46,1248,464,32460,6500

a) \(\frac{234}{585}-\frac{51}{85}=\frac{2}{5}-\frac{3}{5}=\frac{-1}{5}\)

b) \(\frac{364}{-1820}+\frac{-276}{46}-\frac{-52}{46}=\frac{-1}{5}+6+\frac{52}{46}=\frac{-1}{5}+\frac{30}{5}+\frac{26}{23}=\frac{29}{5}+\frac{26}{23}=\frac{667}{115}+\frac{130}{115}=\frac{797}{115}\)

c) \(\frac{-1616}{3232}-\frac{70}{-105}-\frac{186}{217}=\frac{-1}{2}+\frac{70}{105}-\frac{6}{7}=\frac{-1}{2}+\frac{2}{3}+\frac{-6}{7}=\frac{-21}{42}+\frac{28}{42}+\frac{-36}{42}=\frac{7}{42}+\frac{-36}{42}=\frac{-29}{42}\)

d) \(\frac{375}{-450}-\frac{-216}{252}-\frac{448}{-640}=\frac{-5}{6}+\frac{216}{252}+\frac{448}{640}=\frac{-5}{6}+\frac{6}{7}+\frac{7}{10}=\frac{-175}{210}+\frac{180}{210}+\frac{147}{210}=\frac{5}{210}+\frac{147}{210}=\frac{152}{210}=\frac{76}{105}\)

ths bạn nha <3

lấy CASIO ra bạn

có tính nhanh ko?

688.a-688.45=6880

<=>688(a-45)=6880

<=>a-45=10

<=>a=55

\(688\times a-688\times45=6680\)

\(\Leftrightarrow688\times\left(a-45\right)=6680\)

\(\Leftrightarrow a-45=6880\div688\)

\(\Leftrightarrow a-45=10\)

\(\Leftrightarrow a=10+45\)

\(\Leftrightarrow a=55\)
Vậy a = 55 

Học dỏi nha :))
~ Good luck ~

909 x 688 = 625392 duyệt nha

625392

ủng hộ mình lên 220 nha các bạn

1823 * 8 = 14584

688 / 3 = 229(dư 1)

1823x8=14584

688:3=229,3333...

554 - 455 = 99

688 - 957 = -269

Hok tốt !

554 - 455 = 99

688 - 957 = - 269

# cool #

DAU LA DAU NHAN ,DAU LA DAU X VAY BAN VIET LAN LON QUA K NHIN DC

a) ( x - 4 ) . 3 = 21

             x - 4 = 21 : 3

             x - 4 = 7

                  x = 7 + 4

                  x = 11

b) 585 - ( 7x + 60 ) = 455

                  7x + 60 = 585 - 455

                  7x + 60 = 130

                          7x = 130 - 60

                          7x = 70

                            x = 70 : 7

                            x = 10

44 + ( 16 - x ) = 50

=> 16 - x = 50 - 44

=>16 - x = 6

=> x = 16 - 6

=> x = 10