tính nhanh:
a) 37.(25+27)-27.(37+25)
b) 5.(13-26)-26(13-5)+21.13
c)(-250).(-34)+(-25).68
Bài 1:
a) 5 + (-7) + 9 + (-11) +...+ 25 + (-27)
b) 34+35+36+37-24-25-26-27
c) (-100) + 112 + (-114) +...+ (-198) +200
a,-12-13+26-11
b, 25+37-48-25-37
C, 34 + 35 + 36 + 37 – 14 – 15 – 16 – 17
làm nhanh cho mik nha, mik cần gấp ạ. Cảm ơn mn
Tính nhanh:
a) (-25) . 68 + (-34) . (-250)
b) (-2004 - 2004 - 2004 - 2004) . (-25)
c) 7 . 5 + 9 . [(-3) - (-27)]
d) (-15 - 12) : 9 + 5 - 13 . (-2) + (-64) : 8
số nguyên:
15 - ( -15 + 2)=
(-14) - (17 - 8)=
15 - ( 21- 7)=
34 + (-15) - 17=
(-34) + ( -12) + 18=
27 - 15 - 19=
34 - ( -15) +8=
-37 + 13 - 25=
40 - 17 + ( -25)=
16 + (-15 ) - 18=
15 - 14 - 13=
-27 + 15 -17=
34 - 71=
28 - 125=
13 + ( -27)=
14 - (-34)=
28 - (-16)=
-15 -8 =
-27 -34=
-25 - (-18)=
46 - 25 - (-25)=
-37 - (-24)=
46 - (-15)=
-26 - 6 + 7 =
15 - (-15 + 2) = 15 + 13 = 28
(-14) - (17 - 8) = -14 - 9 = -23
15 - (21- 7) = 15 - 14 = 1
34 + (-15) - 17 = 19 - 17 = 2
(-34) + (-12) + 18 = -46 + 18 = -28
27 - 15 - 19 = 12 - 19 = -7
34 - (-15) + 8 = 49 + 8 = 57
-37 + 13 - 25 = -24 - 25 = -49
40 - 17 + (-25) = 23 + (-25) = -2
16 + (-15) - 18 = 1 - 18 = -17
15 - 14 - 13 = 1 - 13 = -12
-27 + 15 - 17 = -12 - 17 = -29
34 - 71 = -37
28 - 125 = -97
13 + (-27) = -14
14 - (-34) = 48
28 - (-16) = 44
-15 - 8 = -23
-27 - 34 = -61
-25 - (-18) = -7
46 - 25 - (-25) = 21 + 25 = 46
-37 - (-24) = -13
46 - (-15) = 61
-26 - 6 + 7 = -32 + 7 = -25
@linhcute
Tìm số nguyên y , biết :
a) - ( - 27 - y ) = 18 - ( - 7 )
b) - ( - y - 28 ) - ( - 11 + 5 ) = ( - 13 ) - 28
c) y - ( 25 + 37 ) - ( 13 + 26 ) = - ( - 42 ) - 142
d) - ( - 315 - y ) - ( - 122 ) = - ( - 25 - 125 )
LÀM ƠN GIÚP MIH NHA !!!!!
AI NHANH VÀ ĐẦY ĐỦ MIH TIK 3 CÁI!!!!!
a) -(-27-y)=18-(-7)
27+y=18+7
27+y=25
y=25-17
y=-2
b) -(-y-28)-(-11+5)=(-13)-28
y+28+11-5=-41
y+39=-41+5
y=-36-39
y=-75
c) y-(25+37)-(13+26)=-(-42)-142
y-62-39=42-142
y-101=-100
y=-100+101
y=1
d) -(-315-y)-(-122)=-(-25-125)
315+y+122=25+125
437+y=150
y=150-437
y=-287
a, -(-27-y)=18-(-7)=27-y=18+7=27-y=25 suy ra y=27-25=2
\(a,-\left(-27-y\right)=18-\left(-7\right)\)
\(\Rightarrow27+y=18+7\)
\(\Rightarrow27-18-7=-y\)
\(\Rightarrow y=-1\)
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37=
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37
=(1+37)x37:2
=703
34 + 35 + 36 + 37 – 24 – 25 – 26 – 27
=(34-24)+(35-25)+(36-26)+(37-27)=10+10+10+10=40
= (34-14) + (35-25)+(36-26)+(37-27)
= 10 +10+10+10=40
\(34+35+36+37-24-25-26-27\\ =\left(34-24\right)+\left(35-25\right)+\left(36-26\right)+\left(37-27\right)\\ =10+10+10+10=40\)
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+149+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39*100
Tính nhanh tổng sau:
A).57+26+34+63=
B).119+36+201+184-37=
C).24+25+26+27+28+29+30+31=
D).2+4+6+8+....+98+100=
a) 57 + 26 +34 +63 = ( 57 + 63 ) + ( 26 + 34 )
= 120 + 60 = 180
b) 119 + 36 +201+184-37 = ( 119 + 201 ) + ( 36 +184 ) - 37
= 320 + 220 - 37
= 540 - 37 = 503
c) 24 + 25 +26+27+28+29+30+31 = ( 24 +31 ) + ( 25 + 30 ) + ( 26 +29) + ( 27 + 28 )
= 55 x 5 = 275
d) 2 + 4 + 6 + 8 +....+ 98+ 100
= {(100 + 2 ) x [(100 - 2) :2 + 1]} : 2
= 102 x 50 : 2
= 5100 : 2 = 2050
a) =180
b) = 503
c) = 220
d) mình không biết ý d
nhưng bạn k cho mình nha
a = 120
b = 503
c = 220
d = 2550