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![](https://rs.olm.vn/images/avt/0.png?1311)
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) \(34+35+36+37-24-25-26-27\)
\(=\left(34-24\right)+\left(35-25\right)+\left(36-26\right)+\left(37-27\right)\)
\(=10+10+10+10\)
\(=40\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, -(-15+125-81)-(-85+75-19+100)
=-15-125+81-(-85)-75+19-100
=-140+81-(-85)-75+19-100
=-59-(-85)-75+19-100
=-16-75+19-100
=-91+19-100
=-72-100
=-172
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 125+70+375+230
= (125+375)+(70+230)
= 500+300 = 800
b, 7 2 . 33 + 7 2 . 67
= 49.33+49.67 = 49.(33+67) = 49.100 = 4900
c, 35.11+65.18+35.13+65.6
= 35.(11+13)+65.(18+6) = 35.24+65.24 = 24.(35+65) = 24.100 = 2400
d, 490 – {[(128+22):3. 2 2 ] – 7}
= 490 – {[150:3.4] – 7}
= 490 – {[50.4] – 7}
= 490 – {200 – 7}
= 490 – 193 = 297
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\left(-25\right).5.\left(-4\right).2\)
\(=\left[\left(-25\right).\left(-4\right)\right].\left(2.5\right)\)
\(=100.10=1000\)
b) \(\left(-456\right)-\left(67-456\right)\)
\(=-456-67+456\)
\(=\left(456-456\right)-67\)
\(=67\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a,=512.(-126)+65536
=-64512+65536
=1024
b,=4524-(-135)-4035
=642
c,=40.(-90)-40.110
=-8000
![](https://rs.olm.vn/images/avt/0.png?1311)
a)31.14+31.(2.43)
=31.14+31.86
=31(14+86)
=31.100
=3100
b)135.(-24)+135.(-75)-135.1
=135[(-24)+(-75)-1]
=135.(-100)
=-13500
a, 31 . 14 + 62 . 43
= 31.14 + 31.86
= 31.(14 + 86)
= 31.100
- 3100
b, -135 . 24 +135 . (-75) - 135
= -135.(24 + 75 + 1)
= -135.100
= -13500
![](https://rs.olm.vn/images/avt/0.png?1311)
Cách nhanh nhất có loại câu này khỏi mục "chưa ai trả lời"
2.
c) /x-2/=9+15=24
x=26
hoạc
x=-22
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 135 . (-27) + 27 . 235
= 27 . (235 - 135)
= 27 . 100
= 2700
b) 36 . (-125) - 125 . (-46)
= 125 . (-36 + 46)
= 125 . 10
= 1250
c) 32 . (-64) - 64 . 68
= 64.(-32 - 68)
= 64.(-100)
= -6400
d) (145 - 45) . (-31) + 31 . (-100)
= 100 . (-31) + 31.(-100)
= 100.(-31 - 31)
= 100.(-62)
= -6200
a)
=(-135)x27+27x235
=27x[+(235+135)]
=27x31725
=856575
b)
=(-36)x125-125x(-46)
=125x[-(36+46)]
=125x(-1656)
=-207000
c)
=(-32)x64-64x68
=64x[-(68-32)]
=64x(-36)
=-(64x36)
=-2304
d)
=100x(-31)+31x(-100)
=(-100)x31+31x(-100)
=31x[-(100+100)]
=31x(-200)
=-(31x200)
=-6200
chúc học tốt nhớ tích cho tui nha
a, \(\left(-75\right)+\left(-325\right)=-400\)
b, \(62+\left|-128\right|=62+128=190\)
c, \(\left(-125\right)+\left|-45\right|=-125+45=-80\)
d, \(\left|-135\right|+\left|70\right|=135+70=205\)
Chúc bạn học tốt!!! Cái bài này lần sau dùng máy tính nhá!
a) (-75) + (-325)=-400
b) 62 + |-128|=62+128= 190
c) (-125) + |-45|=-80
d) |-135| + |70| = 205
Chúc bạn học tốt![hihi hihi](https://hoc24.vn/media/cke24/plugins/smiley/images/hihi.png)