20:5+452:36=?
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(36 x 452 + 904 x 432 ) : 904
= ( 18 x 2 x 452 + 904 x 432 ) : 904
= ( 18 x 904 + 904 x 432 ) : 904
= (18 + 432) x 904 : 904
= 18 + 432
=450
Ta có : (36 x 452 + 904 x 432) : 904
= (18 x 2 x 452 + 904 x 432) : 904
= (18 x 904 + 904 x 432) : 904
= 904.(18 + 432) : 904
= 18 + 432
= 450
a, Ta có: x ∈ B(5) = {0;5;10;15;20;25;...}
Mà x < 20 => x ∈ {0;5;10;15}
b, Ta có: x ⋮ 24; x ⋮ 45 => x ∈ BC{24;45}
24 = 2 3 . 3 ; 45 = 3 2 . 5 => BCNN(24;45) = 2 3 . 3 2 . 5 = 360
=> BC(24;45) = B(360) = {0;360;720;...}
Mà 200 < x < 500 => x = 360
c, Ta có:
452 = px+32 => 420 ⋮ x
321 = qx+21 => 320 ⋮ x
=> x ∈ ƯC(420;320)
420 = 2 2 . 3 . 5 . 7
320 = 2 6 . 5
=> ƯCLN(420;320) = 20 = 2 2 . 5
=> ƯC(420;320) = Ư(20) = {1;2;4;5;10;20}
Vậy x ∈ {1;2;4;5;10;20}
a) 896 × 23 = 896 × (20 + 3)
= 896 × 20 + 896 × 3
= 17920 + 2688
= 20608
896 × 23 = 896 × (24 – 1 )
= 896 × 24 – 896 × 1
= 211504 – 896
= 20608
b) 547 × 38 = 547 × (30 + 8)
= 547 × 30 + 547 × 8
= 20786
547 × 38 = 547 × (39 – 1)
= 547 × 39 - 547 × 1
= 21333 – 547
= 20786
1) \(-452-\left(-67+75-452\right)\)
\(=-452+67-75+452\)
\(=-\left(452-67\right)-75+452\)
\(=-385-75+452\)
\(=-\left(385+75\right)+452\)
\(=-460+452\)
\(=-\left(460-452\right)\)
\(=-8\)
b) \(35-\left\{12-\left[-14+\left(-2\right)\right]\right\}\)
\(=35-\left[12-\left(-14-2\right)\right]\)
\(=35-\left\{12-\left[-\left(14+2\right)\right]\right\}\)
\(=35-\left[12-\left(-16\right)\right]\)
\(=35-\left(12+16\right)\)
\(=35-28\)
\(=7\)
c) \(-\left|-5\right|+\left(-19\right)+18+\left|11-4\right|-57\)
\(=-5-19+18+\left|7\right|-57\)
\(=-5-19+18+7-57\)
\(=-\left(5+19\right)+18+7-57\)
\(=-24+18+7-57\)
\(=-\left(24-18\right)+7-57\)
\(=-6+7-57\)
\(=-\left(6-7\right)-57\)
\(=-\left(-1\right)-57\)
\(=1-57\)
\(=-57+1\)
\(=-\left(57-1\right)\)
\(=-56\)
Mình đặt tên a,b,c cho 3 ý cho dễ gọi nha.
a,\(-452-\left(-67+75-452\right)\)
\(=-452+67-75+452\)
\(=-8\)
b,\(35-\left\{12-\left[-14+\left(-2\right)\right]\right\}\)
\(=35-\left(12+14-2\right)\)
\(=35-24\)
\(=11\)
c,\(-\left|-5\right|+\left(-19\right)+18+\left|11-4\right|-57\)
\(=-5-19+18+7-57\)
\(=-56\)
1: =29-16-3*2=13-6=7
2: =35-12+(-14)-2
=23-16=7
3: =4*3125-32:16
=12500-2
=12498
4: =-452+67-75+452=-8
5: =18+99*18-3^5-2^5
=1800-275
=1525
Câu 1: x = 50
Câu 2: ko bik
386 + 793 = 1179
234 + 673 = 907
573 + 456 = 1029
452 + 352 = 804
-.-
k mik
\(20:5+452:36\)
\(=4+\frac{113}{9}\)
\(=\frac{149}{9}\)