a: \(A=\dfrac{63-48-70}{84}:\dfrac{-3\cdot84+4\cdot60+5\cdot70}{840}\cdot\dfrac{1-14}{12}\)

\(=\dfrac{-55}{84}\cdot\dfrac{840}{338}\cdot\dfrac{-13}{12}=\dfrac{55}{1}\cdot\dfrac{10}{338}\cdot\dfrac{13}{12}=\dfrac{275}{156}\)

b: \(=-234\cdot123+123\cdot4356-123\cdot2312+234\cdot123-234\cdot2312+2312\cdot234+2312\cdot123\)

\(=123\cdot4356-123\cdot2312+123\cdot2312=123\cdot4356=535788\)

123 +123= 246

234+123 = 234 + 123

123+123=246

234+123=234+123

123 + 123= 246

234 + 123 = 234 + 123

Trả lời

123 + 234 = 357

123 x 34 = 4182

123 : 3 = 41

1235 - 876 = 359

~ Hok Tốt ~

= 357

= 4182

= 41

= 359 

Họk tốt nha ! 

mk nhé 

123 + 234= 357

123 X 4 =492

123 : 3 =41

1235 - 876 =359

    TK MÌNH NHA BẠN !!!!!!

28782

123x234=28782

28782

x=234-123

x=111

ai k mình mình k lại cho

111 nha 

k cho mik nhé

\(234-x=123\)

              \(x=234-123\)

             \(x=111\)

\(K\)\(minh\)\(nha!!\)

x + 123 = 234 + 345

x + 123 = 579

x = 579  - 123

x = 456

x + 123 = 234 +345

x + 123 = 579

x = 579 - 123

x = 456

x + 123 = 234 + 345

x + 123 = 579

x = 579 - 123 

 x = 456

=1274.41176471

1274,4118

123 x 234 + 123 x 567

= 123 x ( 234 + 567 )

= 123 x 801

= 98523

= 123 x ( 234 + 567 )

= 123 x             801

=     98523

98523

Tk mik nè, mik nhanh nhứt

28782

Trả lời:

123 x 234 = 28782

Hok tốt!

k nha!

\(123×234=28782\)

=1445664

1445664 nha