Tính nhanh
A.(13+25)+(24-13-42-25)
B.(215-34+127)-(315-144-227)
cho a,b,c,d€z .The thi a-(b-c+d)
tinh nhanh (13+25)+(24-13-42-25)
cho A=2+22+23+24.......+2007+2008 Chung minh Achia het cho 30
cho a khac 0 ket qua phep tinh 0:a=?
Tính nhanh
13.58.4 + 32.26.2+52.10
15.34.4+120.21+21.5.12
14.35.5+10.25.7+20.70
24.( 15+49)+12.(50+42)
53.(51+4)+53.(49+96)+53
42.(15+96)+6.(25+4).7
45.(13+78)+8.(53+25).2
Tính:
a) (-37) + (-112)
b) (-42) + 52
c) 13 - 31
d) 14 - 24 - 12
e) (-25) + 30 - 15
tinh gia tri cua cac bieu thuc sau roi so sanh cac ket qua tinh duoc
(-25)-(-12), 18+(14-42), (-18)-13+17
g)18 . (-24) + 35 . 42 -18 . 76 + 35 . (-142)
h) 104 : (-13) - [ 56 - 220 : ( -4 )]
i)1010: {2500:[ 550 - (4 . 53 - 23 . 25) ]}
j) (72 + 32 . 42 )+(-145 ) + 45 -20230 + 12023
bài 1:Tính nhanh
a,64*25+35*25+25
b,58*42+32*8+5*16
c,(42*43+43*57+43)-360/4
d,(372-19*4)+(981/9-13)
e,456/2*8+456/3-102
a)(-37)+(-112)
b)(-42)+52
c)13-31
d)14-24-12
e)(-25)+30-15
a)(-37)+(-112)
b)(-42)+52
c)13-31
d)14-24-12
e)(-25)+30-15
