a,-1911-(1234-1911)
=>-1911-1234+1911
=>-1234
b,32.(-39)+16.(-22)
=>16.2.(-39)+16.(-22)
=>16.(-78)+16.(-22)
=>16.(-100)
=-1600
li-----------ke nha
-1911-(1234-1911)
156.72+28.156
32.(-39)+16.(-22)
-1945-(567-1945)
184.33+67.184
44.(-36)+22.(-28)
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)
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)
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!!!!
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)
Tính :
a) 27.( 13 - 16 ) - 16.( 13 - 27 )
b) -1911 - ( 1234 - 1911 )
Ai k mk mk k lại, ^_^
27[13-16]-16[13-27] b, -25.21+25.72+49.25 c,-1911-[1234-1911] d, -1945-[567-1945]
-1911-(1234-1911)
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) |
