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(-6).43+45.(-6)+12.(-6)=(-6).(43+45+12)=(-6).100=(-600)
5.(-18-105)-105.(18-5)=5.(-18)+5.(-105)-105.(-18)+105.5=5.(-18)-105.(-18)=(-18).100=(-1800)
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a,-(168+325) + ( 168 + 425 )
= -168 - 325 + 168 + 425
= [ ( -168 ) + 168 ] + [ ( -325 ) + 425]
= 0 + 100
= 100
a. (-6) . 43 + 45.(-6) + 12.(-6)
= (-6) . (43 + 45 + 12)
= (-6) . 100
= -600
b. 5.(18 - 105) - 105.(18 - 5)
= 5.18 - 5.105 - 105.18 + 105.5
= 5.18 - 105.18
= 18.(5 - 105)
= 18.(-100)
= -1800
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) \(34+35+36+37-24-25-26-27\)
\(=\left(34-24\right)+\left(35-25\right)+\left(36-26\right)+\left(37-27\right)\)
\(=10+10+10+10\)
\(=40\)
Bài 5 :\(a,\left(8576-535\right)-8576\)
\(=8576-535-8576\)
\(=\left(8576-8576\right)-535\)
\(=0-535\)
\(=-535\)
\(b,\left(-7105\right)-\left(155-7105\right)\)
\(=-7105-155+7105\)
\(=\left(-7105+7105\right)-155\)
\(=0-155\)
\(=-155\)
\(c,8715+\left(1345+8715\right)\)
\(=8715+1345+8715\)
\(=8715\times2+1345\)
\(=17430+1345\)
\(=18775\)
\(d,\left(35-815\right)-\left(795-65\right)\)
\(=35-815-795+65\)
\(=\left(35+65\right)-\left(815+795\right)\)
\(=100-1610\)
\(=-1510\)
Bài 6 : \(a,25-\left(30+x\right)=x-\left(27-8\right)\)
\(25-30-x=x-19\)
\(-x-x=-19-25+30\)
\(-2x=-14\)
\(x=7\)
\(b,\left(x-2\right)-15=\left(20-7\right)-\left(18+x\right)\)
\(x-2-15=13-18-x\)
\(x+x=13-18+2+15\)
\(2x=12\)
\(x=6\)
a, 4.7.25 + 2.6.5 = (4.25)7 + (2.5)6
= 100.7 + 10.6 = 700 + 60 = 760
b, 164.53 + 47.164 = 164( 53 + 47) = 164 . 100 = 16400
c, 427 + 354 + 373 + 246 + 155 = ( 427 + 373 ) + ( 354 + 246 ) + 155
= 800 + 600 + 155 = 1400 + 155 = 1555
d, 27.(13 + 5) + 18(59 + 14) = 27 . 18 + 18. 73
= 18(27 + 73) = 18. 100 = 1800
Chúc bạn học tốt! ~ 
a,
=85.35-85.27-35.85+35.27
=85.35+85.(-27)-35.85+35.27
=85[35+(-27)+(-35)]+35.27
=85.(-27)+35.27
=-85.27+35.27
=27.[(-85)+35]
=27.(-50)
=-1350
các câu còn lại cũng vậy
a, 85 x ( 35- 27 ) - 35 x ( 35 - 27 )
85 x 8 - 35 x 8
8 x ( 85 - 35 )
8 x 50 = 400
b, ( -45 ) x 69 + 30 x ( -45 ) +( -45)
( -45 ) x ( 69 + 30 + 1)
-45 x 100 = -4500
c , 26 + 7 x ( 4 - 12 )
26 + 7 x ( - 8 )
26 + ( -56 )=(- 30)
d , 127 - 18 x ( 5 + 6 )
127 - 18 x 11
127 - 180 + 18
-53 + 18 = - 35