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-7264 + ( 1543 + 7264 )
=-7264 + 1543 + 7264
=1543
(144 - 97 ) -144
=144 - 97 - 144
=-97
( -145 ) - ( 18 -145 )
= -145 - 18 - 145
=-308
111 + ( -11 + 27 )
=111 - 11 + 27
=127
( 27+ 514 ) - (486-73)
=27 + 514 - 486 - 73
=-18
( 36 + 79 ) + ( 145 - 79 - 36 )
=36 + 79 + 145 - 79 - 36
=145
( 38 -29+ 43 ) - ( 43 + 38 )
=38 - 29 + 43 - 43 + 38
=47
271 - [ ( -43 ) + 271 - ( -17)]
= 271 + 43 + 271 + 17
=602
-144 - [ 29 - ( + 144 ) - ( + 144 ) ]
=-144 - 29 - 144 - 144
=-461
hok tốt !
a) -7264+(1543 +7264) b) (144-97)-144 c)(-145)-(18-145)
=(-7264)+1543+7264 =144-97-144 =(-145)-18+145
= [(-7264)+7264]+1543 =(144-144)-97 =[(-145)+145}-18
=0+1543 =0-97 = 0-18
=1543 = -97 = -18
-145.(13-57)+57.(10-145)
=-145.(-44)+57.(-135)
=6380+(-7695)
=-1315
-145.(13-57)+57.(10-145)=(-145).(-44)+57.(-135)=6380+(-7695)=-1315
BỎ DẤU NGOẶC RỒI TÍNH :
1. - 7264 + ( 1543 + 7264 )
= ( - 7264 ) + 1543 + 7264
= [ ( - 7264 ) + 7264 ] + 1543
= 0 + 1543
= 1543
2. (144 - 97 ) - 144
= 144 + ( - 97 ) + (- 144 )
= [ 144 +( - 144) ] + ( -97 )
= 0 + (- 97)
= - 97
3. ( - 145 ) - ( 18 - 145 )
= ( -145 ) + ( - 18 ) + 145
= [ ( -145 ) + 145 ] + ( -18 )
= 0 + ( - 18)
= - 18
4. 111 + ( - 11 + 27 )
= 111 + ( - 11 ) + 27
= ( 111 + 27 ) + ( -11 )
= 138 + ( -11 )
= 127
5. ( 27 + 541 ) - ( 486 - 73 )
= 27 + 541 + ( - 486) + 73
= ( 27 + 73 ) + [ 541 + ( - 486 )]
= 100 + 55
= 155
6. ( 36 + 79 ) + ( 145 - 79 - 36)
= 36 + 79 + 145 + ( - 79 ) + ( - 36 )
= [ 36 + ( - 36)] + [ 79 + ( -79 )] + 145
= 0 + 0 + 145
= 145
7. 10 - [ 12 - ( -9 - 1) ]
= 10 + ( - 12 ) + 9 + ( -1 )
= ( 10 + 9 ) + [ ( -12 ) + ( - 1) ]
= 19 + ( - 13 )
= 6
8. ( 38 - 29 + 43 ) - (43 + 38 )
= 38 + ( - 29 ) 43 + ( -43 ) +( - 38)
= [ 38 + ( - 38 )] + [ 43 + ( - 43 ) ] + ( - 29 )
= 0 + 0 + ( - 29 )
= - 29
9. 274 - [ ( - 43 ) + 271 - ( - 17 )]
= 274 + 43 + ( - 271 ) + 17
= [ 274 + ( - 271 ) ] + ( 43 + 17 )
= 3 + 60
= 63
10. - 144 - [ 29 - ( + 144 ) - ( + 144 )
= ( - 144 ) + ( - 29 ) + 144 +( - 144 )
= [ ( - 144 ) + 144 ] + [ ( -29) + ( - 144 ) ]
= 0 + ( - 173 )
= - 173
k cho mk nếu đúng . Sai thì thôi nhé . ahihi
=
\(1.-7264+\left(1543+7264\right)\)
\(=-7264+1543+7264\)
\(=1543\)
\(2.\left(144-97\right)-144\)
\(=144-97-144\)
\(=-97\)
\(3.\left(-145\right)-\left(18-145\right)\)
\(=-145-18+145\)
\(=-18\)
\(4.111+\left(-11\right)+27\)
\(=111-11+27\)
\(=100+27\)
\(=127\)
\(5.\left(27+541\right)-\left(486-73\right)\)
\(=27+541-486+73\)
\(=\left(27+73\right)+\left(541-486\right)\)
\(=100+55\)
\(=155\)
các câu còn lại tương tự phá ngoặc ra nha
\(A=1+2\left(1+1\right)+3\left(2+1\right)+4\left(3+1\right)+...+100.\left(99+1\right).\)
\(A=1+1.2+2+2.3+3+3.4+4+...+99.100+100\)
\(A=\left(1+2+3+4+...+100\right)+\left(1.2+2.3+3.4+...+99.100\right)\)
\(B=1+2+3+4+...+100=\frac{100\left(1+100\right)}{2}=5050\)
\(C=1.2+2.3+3.4+...+99.100\)
\(3C=1.2.3+2.3.3+3.4.3+...+99.100.3\)
\(3C=1.2.3+2.3\left(4-1\right)+3.4\left(5-2\right)+...+99.100\left(101-98\right)\)
\(3C=1.2.3+2.3.4-1.2.3+3.4.5-2.3.4+...+99.100.101-98.99.100\)
\(3C=99.100.101\Rightarrow C=\frac{99.100.101}{3}=33.100.101=333300\)
\(A=B+C=5050+333300=338350\)
x là số nguyên => x+2; y-1 là số nguyên
=> x+2; y-1 \(\in\)Ư(2)={-2;-1;1;2}
ta có bảng
x+2 | -2 | -1 | 1 | 2 |
x | -4 | -3 | -1 | 0 |
y-1 | -1 | -2 | 2 | 1 |
y | 0 | -1 | 3 | 2 |
Vậy x;y ={(-4;0);(-3;-1);(-1;3);(0;2)}
Bài 1 : bỏ dấu ngoặc rồi tính.
1, -7264+(1543+7264)
\(=-7264+1543+7264\)
\(=-8807+7264\)
\(=-1543\)
2, ( 144-97) - 144
\(=144-97-144\)
\(=47-144\)
\(=-97\)
3, ( -145) - ( 18- 145)
\(=-145-18+145\)
\(=-163+145\)
\(=18\)
4, 111+ ( -11+27)
\(=111+\left(-11\right)+27\)
\(=100+27\)
\(=127\)
5, ( 27+ 514) -( 486-73)
\(=27+514-486+73\)
\(=541-486+73\)
\(=55+73\)
\(=128\)
6, ( 36 + 79) + ( 145-79-36)
\(=36+79+145-79-36\)
\(=115+145-79-36\)
\(=260-79-36\)
\(=145\)
7, 10-[12-(- 9-1)]
\(=10-12+9+1\)
\(=8\)
8, ( 38-29+43) -( 43+38)
\(=38-29+43-43-38\)
\(=-29\)
9, 271-[(-43)+271-(-17)]
\(=271+43-271+17\)
\(=60\)
10, -144-[29-(+144)-(+144)]
\(=-144-29-144-144\)
\(=-461\)
145+43+(-145)+57
=[145+(-145)]+(43+57)
=0+100
=100
Vote mình nhé!