Ta nhân thì thấy 6 x 7 = 42 . Ta lấy 42 trừ đi 42 bằng 5

câu 1: x=628

câu 2: 7944

câu 3: 27000

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câu 1: 739

câu2:6295

64:x=21 dư 1

(64-1):x=21

63:x=21

x=3

tiếp:

x:6=7 dư 3

(x-3):6=7

x-3=42

x=45

còn lại tương tự

Nếu xài thông cảm nhé mk học ngu nắm

706 k nhe

=\(3a+6a-1a=3680+1968\)

=\(3a+6a+1a=5648\)

\(a\left(3+6+1\right)=5648\)

\(10a=5648\)

\(a=564,8\)

=160 nha nguyễn mạnh nghĩa

 x : 5 + 387 = 419 

x :5 =419-387

x:5=32

   x=32x5

    x=160

x:5=9 ( dư 2 )

x=9x5+2

x=47

x:6=9 ( dư 5 )

x=9x6+5

x=59

x:8=4 ( dư 1 )

x=4x8+1

x=33

x : 5 = 9 ( dư 2 ) = 9 x 5 + 2 = 47

 x : 6 = 9 ( dư 5 ) = 6 x 9 + 5 = 62

x : 8 = 4 ( dư 1 ) = 8 x 4 + 1 = 33

hok tốt