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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
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: \(=13\cdot55-13\cdot29-55\cdot13+55\cdot29\)
\(=-13\cdot29+55\cdot29=29\cdot42=1218\)
b: \(=37\cdot27+37\cdot25-27\cdot37-27\cdot25\)
\(=27\cdot12=324\)
c: \(=-25\left(28+72\right)=-25\cdot100=-2500\)
34 + 35 + 36 + 37 - 24 - 25 - 26 - 27
= (34 - 24) + (35 - 25) + (36 - 26) + (37 - 27)
= 10 + 10 + 10 + 10
= 10 x 4
= 40
34+35+36+37-24-25-26-27
=(34-24)+(35-25)+(36-26)+(37-27)
= 10 + 10 + 10 + 10
=10x4
=40
34+35+36+37-24-25-26-27
= (34-24)+(35-25)+(36-26)+(37-27)
= 10+10+10+10
= 40
tính tổng sau một cách hợp lý
34+35+36+37-24-25-26-27
=(34-24)+(35-25)+(36-26)+(37-27)
=10+10+10+10
=40
a) \(-75+\left(-325\right)+\left|-45\right|-\left(-125\right)\)
\(=-75-325+45+125\)
\(=\left(45+125\right)-\left(75+325\right)\)
\(=170-400\)
\(=-230\)
b) \(62+\left|128\right|-\left|-155\right|-\left|70\right|\)
\(=62+128-155-70\)
\(\Leftrightarrow190-225\)
\(=-35\)
c) \(815+\left[95+\left(-815\right)+\left(-45\right)\right]\)
\(=815+95-815-45\)
\(=\left(815-815\right)+\left(95-45\right)\)
\(=0+50\)
\(=50\)
d) \(5+\left(-7\right)+9+\left(-11\right)+...+25+\left(-27\right)\)
\(=\left(5-7\right)+\left(9-11\right)+...+\left(25-27\right)\)
\(=-2-2-...-2\)
\(=-2.11\)
\(=-22\)
e) \(34+35+36+37-24-25-26-27\)
\(=\left(34-24\right)+\left(35-25\right)+\left(36-26\right)+\left(37-27\right)\)
\(=10+10+10+10\)
\(=40\)
a: \(=37\cdot25+37\cdot27-27\cdot37-27\cdot25\)
\(=37\cdot25-27\cdot25=25\cdot10=250\)
b: \(=5\cdot\left(-13\right)-26\cdot8+21\cdot13\)
\(=13\left(-5+21\right)-13\cdot16\)
=13x16-13x16=0
c: =250x34-25x68
=125x68-25x68
=68x100=6800