tính nhanh
13 * 8 * 250 =
364 - (364 - 111) =
1+2+3+4+5+...1500
thực hiện các phép tính sau:
1, 5+22+37+2
2, 12-6+26-4
3, (2016+450)-2016
4, 364-(364-111)
5, 1972-(638+972)
giúp mình, mình đang cần gấp
tính nhanh
B=1+2-3-4+5+6-7-8+9+10-11-12+....-111-112+113+114
tìm x
697:[(15x+364):x]=17
mk cần gấp
Bài 1:
B = 1+2-3-4 + 5 + 6-7-8 + 9+10-11-12+...+110-111-112+113+114
B = 1 + (-5) + 5 + 9 + (-13)+...+ (-113) + 113 + 114
B = 1 + 114
B = 115
Bài 2:
697 : [(15x+364) : x ] = 17
(15x+364) . 1/x = 697 : 17
(15x+364) . 1/x = 41
15x. 1/x + 364.1/x = 41
15 + 364/x = 41
364/ x = 41-15
364/x = 26
x = 364 : 26
x = 14
Ta sẽ nhóm 4 số với nhau
B=(1+2-3-4)+(5+6-7-8)+(9+10-11-12)+...+(109+110-111-112)+113+114
B=-4+(-4)+(-4)+...+(-4)+113+114 (Có 28 thừa số -4)
B=-4*28+113+114
Giải tiếp bên dưới hồi nãy ấn nhầm:
B=-112+113+114
B=115
Bài 2
697:[(15X+364):X]=17
(15X+364)x1/X=697:17
(15X+364)x1/X=41
15Xx1/X+364x1/X=41
15+364/X=41
364/X=41-15
364/X=26
X=364/26
X=14
thực hiện các phép tính sau:
1, 5+22+37+2
2, 12-6+26-4
3, (2016+450)-2016
4, 364-(364-111)
5, 1972-(638+972)
1,
=66
2,
=28
3,
=2016+450-2016
=450
4,
=360-360+111
=111
5,
=1972-638-972
=1972-972-638
=362
1) = 27 + 37 + 2
= 64 + 2 = 66
2) = 6 + 26 - 4 = 32 - 4 = 28
3) = (2016-2016)+450 = 450
4) =(364-364)+111 = 111
5) = (1972-972)-638 = 1000 - 638 = 362
1. 5 + 22 + 37 + 2
= 27 + 39
= 66
2. 12 - 6 + 26 - 4
= 6 + 22
= 28
3. (2016 + 450) - 2016
= 2016 + 450 - 2016
= 2016 - 2016 + 450
= 450
4. 364 - (364 - 111)
= 364 - 364 + 111
= 0 + 111
= 111
5. 1972 - (638 + 972)
= 1972 - 638 - 972
= 1972 - 972 - 638
= 1000 - 638
= 362
tính nhanh
B=1+2-3-4+5+6-7-8+9+10-11-12+....-111-112+113+114
tìm x
697:[(15x+364):x]=17
a: B=(1+2-3-4)+(5+6-7-8)+...+(109+110-111-112)+227
=(-4)+(-4)+...+(-4)+227
=-112+227=115
b: =>(15x+364):x=41
=>15x+364=41x
=>-26x=-364
=>x=14
Các bạn ơi giúp mình :
1, Tính nhanh
a,364-(364-111)
b,249-(75-51)
c,100+98+96+..+2-97-95-...-1
a, 364 - ( 364 - 111 )
= ( 364 - 364 ) + 111
= 0 + 111
= 111
b, 249 - ( 75 - 51 )
= ( 249 + 51 ) - 75
= 300 - 75
= 225
1, Tính nhanh
a,364-(364-111)
364 - 364 + 1110 + 111111b,249-(75-51)
249 - 75 - 51( 249 + 51 ) -75300 - 75225c,100+98+96+..+2-97-95-...-1
= 100 + ( 98 - 97 ) + ( 96 - 95 ) + ...+ ( 2-1)= 100 + 1+1+...1= 100 + 1.49= 100 + 49= 1491)
a) \(364-\left(364-111\right)\)
\(=364-364+111\)
\(=\left(364-364\right)+111\)
\(=0+111=111\)
b) \(249-\left(75-51\right)\)
\(=249-75+51\)
\(=\left(249+51\right)-75\)
\(=300-75=225\)
364-(364-111);249-(75-51)
364-(364-111)=364-364+111=111
249-(75-51)=(249+51)-75=300-75=225
C1: * 364 - (364 - 111)
= 364 - 364 + 111
= 111
* 249 - (75 - 51)
= 249 - 75 + 51
= (249 + 51) - 75
= 300 - 75
= 225
C2: * 364 - (364 - 111)
= 364 - 253
= 111
* 249 - (75 - 51)
= 249 - 24
= 225
Tính nhẩm :
( 1999 + 313 ) – 1999 ; ( 1435 + 213 ) -132034 – ( 34 + 1560 ) ; 1972 – ( 368 + 972 )364 – ( 364 – 111 ) ; 249 – ( 75 – 51 )Giải :
( 1999 + 313 ) – 1999 = 1999 – 1999 + 313 = 313( 1435 + 213 ) – 13 = 1435 + ( 213 – 13 ) = 1435 + 200 = 1635
2034 – ( 34 + 1560 ) = ( 2034 – 34 ) – 1560 = 2000 – 1560 = 4401972 – ( 364 + 972 ) = 1972 – 972 – 368 = 1000 – 368 = 632
c. 364 – ( 364 – 111 ) = 364 – 364 + 111 = 111
249 – ( 75-51 ) = ( 249 + 51 ) – 75 = 300 – 75 = 225
1 tính
1+2-3-4+5+6-7-8+......-299-30+301+302
2 tìm x
697:[ (15X+364) : X ]=17
X+5:2-(32+16*3:16-15)+0
|x|=1+2+3+4+5+...+2010 tìm x
2mũ x=2+4+6+8+10+...+2010 tìm x
697:15a+364/a=17 tìm a
\(\left|x\right|=1+2+3+...+2010\)
\(\left|x\right|=\frac{\left(2010+1\right).2010}{2}\)
\(\left|x\right|=2011.1005\)
\(\left|x\right|=2021055\)
\(x=\pm2021055\)
\(2^x=2+4+6+...+2010\)
\(2^x=\frac{\left(2010+2\right).1005}{2}\)
\(2^x=1006.1005\)
\(x=\frac{log\left(1011030\right)}{log\left(2\right)}\)(Nguồn: wolframalpha)
\(697\div15a+\frac{364}{a}=17\)
\(\frac{697}{15a}+\frac{5460}{15a}=17\)
\(6157=17.15a\)
\(6197=255a\)
\(a=\frac{6197}{255}\)