a x 3 + a x 6 - a - 1968 = 3680
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a x [3+6-1]-1968=3680
a x 8 -1968=3680
ax8=3680+1968
ax8=5648
a=706
=\(3a+6a-1a=3680+1968\)
=\(3a+6a+1a=5648\)
\(a\left(3+6+1\right)=5648\)
\(10a=5648\)
\(a=564,8\)
Ta có:a.3 + a.6-a-1968=3680
=>a.(3+6)-a-1968=3680
=>a.9-a-1968=3680
=>a.9-a=3680+1968
=>a.8=5648
=>a=5648:8
=>a=706
ax3+ax6-a-1968=3680
ax3+ax6-ax1-1968=3680
ax(3+6-1)-1968=3680
ax8=3680+1968
ax8=5648
a=5648:8
a=706
a x 3 + a x 6 - a -1968 = 3680
a x ( 3 + 6 ) - a -1968 = 3680
a x 9 - a - 1968 = 3680
a x 8 - 1968 = 3680
a x 8 = 3680 + 1968
a x 8 = 5648
a = 5648 : 8
a = 706
a x 3 + a x 6 - a -1968 = 3680
a x ( 3 + 6 ) - a -1968 = 3680
a x 9 - a - 1968 = 3680
a x 8 - 1968 = 3680
a x 8 = 3680 + 1968
a x 8 = 5648
a = 5648 : 8
a = 706
a) 1968 x 15 + 1968 x 84 + 1968
= 1968 x 15 + 1968 x 84 + 1968 x 1
= 1968 x (15 + 84 + 1)
= 1968 x 100 = 196800
b) 6412 + 5378 + 3582 + 4628
= (6412 + 5378) + (3582 + 4628)
= 11790 + 8210
= 20000
c) 178 x 101 - 178
= 178 x 101 - 178 x 1
= 178 x (101 - 1)
= 178 x 100
= 17800
d) 153 x 8 + 153 + 153
= 153 x 8 + 153 x 1 + 153 x 1
= 153 x (8 + 1 + 1)
= 153 x 10
= 1530
a. 7804 - x . 6 + 3829 = 5315
=> 11633 - x . 6 = 5315
=> x . 6 = 11633 - 5315
=> x . 6 = 6318
=> x = 6318 : 6
=> x = 1053
b. x . 23 + x . 35 - 1968 = 10270
=> x . 58 = 10270 + 1968
=> x . 58 = 12238
=> x = 12238 : 58
=> x = 211
c. 3.(x-2) - 2.(x+1) = -30
=> 3.x - 6 - 2.x - 2 = -30
=> x - 8 = -30
=> x = -30 + 8
=> x = -22
d. 42 + (3x + 7) : 2 = 25 + 34
=> 42 + (3x + 7) : 2 = 32 + 81
=> (3x + 7) : 2 = 32 + 81 - 42
=> (3x + 7) : 2 = 71
=> 3x + 7 = 71 . 2
=> 3x + 7 = 142
=> 3x = 142 - 7
=> 3x = 135
=> x = 135:3
=> x = 45
a, (x-3418)+1968=1968+2582
x-3418 =1968+2582-1968
x-3418 =2582
x =2582+3418
x =6000
b,12346+(x+975)=3957+3975
12346+(x+975)=7932
x+975=12346-7932
x+975=4414
x =4414-975
x =3439
a x 3 + a x 6 - a -1968 = 3680
a x ( 3 + 6 ) - a -1968 = 3680
a x 9 - a - 1968 = 3680
a x 8 - 1968 = 3680
a x 8 = 3680 + 1968
a x 8 = 5648
a = 5648 : 8
a = 706
a x 3 + a x 6 - a -1968 = 3680
a x ( 3 + 6 ) - a -1968 = 3680
a x 9 - a - 1968 = 3680
a x 8 - 1968 = 3680
a x 8 = 3680 + 1968
a x 8 = 5648
a = 5648 : 8
a = 706