763+6
nếu giá trị của chữ số 6 trong số 1 763 402 là:
Bài 3: Tìm x e Z:
1) 71 – (33 + x)= 26
2) (x + 73) – 26 = 76
3) x - 7 = -5
4) -23 +x = - (- 25)
5) -5 < x ≤ 6
6) 140 : (x – 8) = 7
1, <=>33+x=45
<=> x = 12
Vậy x=12
2, <=>x+73 =102
<=> x =29
3,x=2
4, -23+x=25<=>x=2
6, x-8=20<=>x=28
Số?
450 + 279 = 729 7142 + 462 = 7 604 56 + 4 763 = 4 819
279 + 450 = ? 462 + 7 142 = ? 4 763 + 56 = ?
Tính nhanh :
a, 29+132+237+868+763
b, 35 * 34 + 35 * 38 + 65 * 75 +45
c, 3 * 25 *8 +4*37*6 +2*38*12
a) 29 + 132 + 237 + 868 + 763
= ( 132 + 868 ) + ( 237 + 763 ) + 29
= 1000 + 1000 + 29
= 1000 x 2 + 29
= 2000 + 29
= 2029
b) 35 x 34 + 35 x 38 + 65 x 75 + 45
= 35 x ( 34 + 38 ) + 65 x 75 + 45
= 35 x 72 + 65 x 75 + 45
= 2520 + 4875 + 45
= 2520 + 4920
= 7440
c) 3 x 25 x 8 + 4 x 37 x 6 + 2 x 38 x 12
= ( 3 x 8 ) x 25 + ( 4 x 6 ) x 37 + ( 2 x 12 ) x 38
= 24 x 25 + 24 x 37 + 24 x 38
= 24 x ( 25 + 37 + 38 )
= 24 x 100
= 2400
a)29+132+237+868+763
=(132+868)+(237+763)+29
= 1000 + 1000 +29
= 2029
a,29+132+237+868+763
=29+(132+868)+(237+763)
=29+1000+1000
=2029
763-438=?
7x4(X-11)=763
\(7.4.\left(x-11\right)=763\)
\(28x-308=763\)
\(28x=1071\)
\(x=\dfrac{153}{4}\)
7 x 4 ( x - 11) = 763
28 ( x - 11) = 763
x - 11 = 763 - 28
x - 11 = 735
x = 735 - 11
x = 724
-53 * 237 + 763 * ( -53 )
$-53\cdot237+763\cdot(-53)$
$=-53\cdot(237+763)$
$=-53\cdot1000$
$=-53000$
-53.237 + 763.(-53)
= - 53.( 237 + 763)
= - 53. 1000
= -53000
-53 . 237 + 763 . (-53)
= -53 . (237 + 763)
= -53 . 1000
= -53000
Chứng minh rằng: 7 6 3 > 7 3 6
\(7x\left(x-11\right)=763\)
\(7\times\left(x-11\right)=763\\ x-11=763:7\\ x-11=109\\ x=109+11\\ x=120\)