Bài 1 : Tính
1) ( -7 ) + ( -14)
2) ( -35) +(-9)
3) ( -5 ) + ( -246 )
4) ( -21) + (-17 )
5) (-39) + (-23)
6) ( -29 ) + (-15 )
7) (-74 ) + (-80)
8) ( -56 ) + (-25 )
9) ( -71 ) + ( -49 )
10 ) -99 + (-10 )
11 ) (-23 ) + 105
12 ) ( -44) + 63
13) ( -77) + 79
14 ) ( -93 ) + 99
15) ( -72 ) + 84
16 ) ( -38 ) + 17
17 ) ( -75 ) + 50
18 ) ( -59 ) + 45
19 ) ( -67) + 23
20 ) ( -98 ) + 31
21) 80+ ( -220)
22) 23 + ( -42)
23 ) 41+ ( -64 )
24 ) ( -57 ) + 57
25 ) 43 + ( - 79 )
26 ) -11+ 32
27 ) (-17 ) + 83
28 ) – 96 + 100
29 ) -99 + 217 30 ) -100 + 97
Bài 2 : Tìm x ∈ Z biết
1)x – 51 = - 21
2) x – 5 = - 8
3) x + 7 = (-14) + 28
4)5- x = (-2 ) + 3
5) x- 46 = (- 21 ) +(-87 )
6) x + 54 = (- 23 ) + 23
nhiều thế =)))
Bài 1 : Tính
1) ( -7 ) + ( -14)= -21
2) ( -35) +(-9) = -44
3) ( -5 ) + ( -246 ) = -251
4) ( -21) + (-17 ) = -38
5) (-39) + (-23) = -62
6) ( -29 ) + (-15 ) = -44
7) (-74 ) + (-80) = -154
8) ( -56 ) + (-25 ) = -81
9) ( -71 ) + ( -49 ) = -120
10 ) -99 + (-10 ) = -109
11 ) (-23 ) + 105 = 82
12 ) ( -44) + 63 = 19
13) ( -77) + 79 =2
14 ) ( -93 ) + 99 =6
15) ( -72 ) + 84 =12
16 ) ( -38 ) + 17 = -21
17 ) ( -75 ) + 50 =-25
18 ) ( -59 ) + 45 = -14
19 ) ( -67) + 23 = -44
20 ) ( -98 ) + 31 = -67
21) 80+ ( -220) = -140
22) 23 + ( -42) = -19
23 ) 41+ ( -64 ) =-23
24 ) ( -57 ) + 57 =0
25 ) 43 + ( - 79 ) =-36
26 ) -11+ 32 =21
27 ) (-17 ) + 83 = 66
28 ) – 96 + 100 =4
29 ) -99 + 217 = 118 30 ) -100 + 97 =-3
Bài 2 : Tìm x ∈ Z biết
1)x – 51 = - 21
x= -21+51
x= 30
2) x – 5 = - 8
x= -8+5
x=-3
3) x + 7 = (-14) + 28
x+7 = 14
x=14-7
x=7
4)5- x = (-2 ) + 3
5-x = 1
x=5-1
x=4
5) x- 46 = (- 21 ) +(-87 )
x-46 = -108
x=-108 +46
x=-62
6) x + 54 = (- 23 ) + 23
x+54 =0
x= 0-54
x=-54
HT
mik làm r đó, bận check đi nhá :)))