7, –1911 – (1234 – 1911)
8, 156.72 + 28.156
9, 32.( -39) + 16.( –22)
10, –1945 – ( 567– 1945)
11, 184.33 + 67.184
12, 44.( –36) + 22.( –28)
-1911-(1234-1911)
156.72+28.156
32.(-39)+16.(-22)
-1945-(567-1945)
184.33+67.184
44.(-36)+22.(-28)
Bài 1: Tính hợp lí nhất
1, 2155– (174 + 2155) + (-68 + 174)
2, -25 . 72 + 25 . 21 – 49 . 25
3, 35(14 –23) – 23(14–35)
4, 8154– (674 + 8154) + (–98 + 674) 5, – 25 . 21 + 25 . 72 + 49 . 25
6, 27(13 – 16) – 16(13 – 27)
7, –1911 – (1234 – 1911)
8, 156.72 + 28.156
9, 32.( -39) + 16.( –22)
10, –1945 – ( 567– 1945)
11, 184.33 + 67.184
12, 44.( –36) + 22.( –28)
câu 1 = -68
câu 2 =-2500
câu 3=168
câu 4 =4571
câu 6=124
Tính hợp lí nhất :
1/2155-(174+2155)+(-68+174)
2/-25.72+25.21-49.25
3/35(14-23)-23(14-35)
4/8154-(674+8154)+(-98+674)
5/-25.21+25.72+49.25
6/27(13-16)-16(13-27)
7/-1911-(1234-1911)
8/156.72+28.156
9/32.(-39)+16.(-22)
10/-1945-_567-1945
11/184.33+67.184
a2/44.(-36)+22.(-28)
7, –1911 – (1234 – 1911) 8, 156.72 + 28.156 9, 32.( -39) + 16.( –22) 10, –1945 – ( 567– 1945) 11, 184.33 + 67.184 12, 44.( –36) + 22.( –28) |
= -1991+1234+1911
=-1991+1911+1234
=0+1234
=1234
tyinh:(1-28/10)(1-52/22)(1-80/36)....(1-21808/10900)
1, 156.72+28.156
2, 32.(-39)+16.(-22)
3, -1945-(567-1945)
4, 184.33+67.184
5, 44.(-36)+22.(-28)
Mk đag cần gấp nhé.
1.
156.72+156.28
=156.(72+28)
=156.100
=15600
2.
32.(-39)+16.(-22)
=16.2.(-39)+16.(-22)
=16.[2.(-39)+(-22)]
=16.(-100)
=-1600
3.
-1945-(567-1945)
=-1945-567+1945
=-1945+1945-567
=0-567
=-567
4.
184.33+67.184
=184.(33.67)
=184.100
=18400
5.
44.(-36)+22.(-28)
=2.22.(-36)+22.(-28)
=22.[2.(-36)+(-28)]
=22.(-100)
=-2200
học tốt nhé
Bài 1: Tính một cách hợp lý
6/ 27(13-16) - 16(13 - 27)
7/ -1911 - (1234 - 1991)
8/ 156.72 + 28 . 156
9/ 32 . (-39) + 16 . (-22)
10/ -1945 - (567 - 1945)
11/ 184. 33 + 67. 184
12/ 44.(-36) + 22 . (-28)
Bài 1: Tính một cách hợp lí:
1) 2155 - ( 174 + 2155 ) + ( -68 + 174 ) 7) -1911 - ( 1234 - 1911 )
2) -25 . 72 + 25 . 21 - 49 . 25 8) 156 . 72 + 28 . 156
3) 35 . ( 14 - 23 ) - 23 . ( 14 - 35 ) 9) 32. ( -39 ) + 16 . ( -22 )
4) 8154 - ( 674 + 8154 ) + ( -98 + 674 ) 10) -1945 - ( 567 - 1945 )
5) -25 . 21 + 25 . 72 + 49 . 25 11) 184 . 33 + 67 . 184
6) 27 . ( 13 - 16 ) - 16 . ( 13 - 27) 12) 44 . ( -36 ) + 22 . ( -28 )
1) 2155-(174+2155)+(-68+174-7)-1911-(1234-1911)
=2155-174-2155+(-68)+174-7-1911-1234+1911
=(2155-2155)+(174-174)+(1911-1911)-(68+7+1234)
= 0 + 0 + 0 - 1309
= -1309
Tính hợp lí nhất:
1) 2155 - (174 + 2155) + (-68 + 174)
2) -25 . 72 + 25 . 21 - 49 . 25
3) 35(14 - 23) - 23(14 - 35)
4) 8154 - (674 + 8154) + (-98 + 674)
5) -25 . 21 + 25 . 72 + 49 . 25
6) 27(13 - 16) - 16(13 - 27)
7) -1911 - (1234 - 1911)
8) 156 . 72 + 28 . 156
9) 32 . (-39) + 16.(-22)
10) -1945 - ( 567 - 1945)
11) 184 . 33 + 67 . 184
12) 44 . (-36) + 22 . (-28)
( Mk cần gấp)
1) 2155-(174+2155)+(-68+174)
=2155-174-2155-68+174
=2155-2155+174-174-68
=0+0-68
=-68
2) -25.72+25.21-49.25
=25.[(-72)+21-49]
=25.(-100)
=-2500
3) 35(14 - 23) - 23(14 - 35)
= 35.14 - 35.23 - (23.14 - 23.35)
= 35.14 - 35.23 - 23.14 + 23.35
= (35.14 - 23.14) + (23.55 - 35.23)
= 14.(35-23) + 0
= 14.12 + 0
= 168
4) 8154 - (674 + 8154) + (-98 + 674)
= 8154 - 674 - 8154 - 98 + 674
= (8154 - 8154) + (674 - 674) - 98
= 0 + 0 - 98
= -98
5) (-25).21 + 25.72 + 49.25
= 25.[(-21) + 72 + 49]
= 25.100
= 2500
6) 27(13 - 16) - 16(13 - 27)
= 27.13 - 27.16 - (16.13 - 16.27)
= 27.13 - 27.16 - 16.13 + 16.27
= (27.13 - 16.13) + (16.27 - 27.16)
= 13.(27-16) + 0
= 13.11 + 0
= 143
7) (-1911) - (1234 - 1911)
= (-1911) - 1234 + 1911
= [(-1911) + 1911] - 1234
= 0 - 1234
= -1234
8) 156.72 + 28.156
= 156.(72+28)
= 156.100
= 15600
9) 32.(-39) + 16.(-22)
= 16.2.(-39) + 16.(-22)
= 16.(-78) + 16.(-22)
= 16.[(-78) + (-22)]
= 16.(-100)
= -1600
10) (-1945) - (567 - 1945)
= (-1945) - 567 + 1945
= [(-1945) + 1945] - 567
= 0 - 567
= -567
11) 184.33 + 67.184
= 184.(33 + 67)
= 184.100
= 18400
12) 44.(-36) + 22.(-28)
= 22.2.(-36) + 22.(-28)
= 22.(-72) + 22.(-28)
= 22.[(-72) + (-28)]
= 22.(-100)
= -2200
BT1 Thực hiện phép tính (tính nhanh có thể ):
1, 27.(13-16)-16.(13-27)=?
2 -1911-(1234-1911)=?
3 32.(-39)+16.(-22)=?
4 -(567-1945)-1945=?
5 44.(-36)+22.(-28)=?
Giúp mk với nha!!!!
1, 27.(13-16)-16.(13-27)=27.(-3)-16(-14)=-81-(-224)=143
2 -1911-(1234-1911)=-1911-1234+1911=-1234
3 32.(-39)+16.(-22)=16.2(-39)+16(-22)=16(-78)+16(-22)=16[(-78)+(-22)]=16.(-100)=-1600
4 -(567-1945)-1945=-567+1945-1945=-567
5 44.(-36)+22.(-28)=22.2(-36)+22(-28)=22(-72)+22(-28)=22[(-72)+(-28)]=22.(-100)=-2200
k mình nhé