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Bài 1:
29.(85-47)+85.(47-29)
=29.38+85.18
=1102+1530
=2632
BÀI 2
a, 15x = -75
x =( -75) : 15
x = -5
Vậy x= -5
b,-5x+8=-27
-5x = -27 - 8
-5x= -35
x =-35 : -5
x = 7
Vậy x = 7
c,3.(17 + x ) = - 42
17 + x = - 42 : 3
17 + x = -14
x = - 14 - 17
x = -31
Vậy x = - 31
d,-10 -( 2x -16) = 0
2x - 16 = 10-0
2x - 16 = 10
2x = 10 +16
2x = 26
x = 26 : 2
x = 13
Vậy x = 13
e,( mik ko bít làm)
f,( tự làm nghen bạn)
1. a) 4.415.8.25.125
= (4.25). (8.125).415
= 100.1000.415
= 100000.415
= 41500000
b) 2.31.12+4.42.6+8.27.3
= (2.31.12)+(4.42.6)+(8.27.3)
= (2.12).31+(4.6).42+(8.3).27
= 24.31+24.42+24.27
= 24 (31+42+27)
= 24.100
= 2400
a) \(a^2\cdot a^3\cdot a^7\cdot b^2\cdot b\)
\(=\left(a^2\cdot a^3\cdot a^7\right)\cdot\left(b^2\cdot b\right)\)
\(=a^{12}\cdot b^3\)
b) \(b^6\cdot b\cdot c^7\cdot c^8\)
\(=\left(b^6\cdot b\right)\cdot\left(c^7\cdot c^8\right)\)
\(=b^7\cdot c^{15}\)
c) \(a^8\cdot a^9\cdot a\cdot c\cdot c^{20}\)
\(=\left(a^8\cdot a^9\cdot a\right)\cdot\left(c\cdot c^{20}\right)\)
\(=a^{18}\cdot c^{21}\)
d) \(a^2\cdot a^3\cdot b^4\cdot c\cdot c^3\)
\(=\left(a^2\cdot a^3\right)\cdot b^4\cdot\left(c\cdot c^3\right)\)
\(=a^5\cdot b^4\cdot c^4\)
a) Kiểm tra lại nhé
b) \(b^6.b^7.c^8\)
\(=b^{6+7}.c^8=b^{13}.c^8\)
c) \(a^8.a^9.a.c.c^{20}\)
\(=a^{8+9+1}.c^{1+20}\)
\(=a^{18}.c^{21}\)
d) \(a^2.a^3.b^4.c.c^3\)
\(=a^{2+3}.b^4.c^{1+3}\)
\(=a^5.b^4.c^4\)
\(#WendyDang\)
1,a, 33-13(-18)=33-(-234)=267
b, 160.53+47.160=160.(53+47)=160.100=16000
c, 180:{150:[100:(24.2-42.3)]}
=180:{150:[100:(24.2-16.3)]}
=180:{150:[100:(48-48)]}
=180:[150:(100:0)] (loại vì ko có stn nào nhân vs 0 = 100)
d,43-23+(-11)=10+(-11)=-1
e,120.64+36.120=120.(64+36)=120.100=12000
g, 15.{72:[100-(12+45:42)]}
=15.{72:[100-(12+43)]}
=15.{72:[100-(12+64)]}
=15.[72:(100-76)]
=15.(72:24)
=15.3=45
2,a, x-36=82
x=82+36=118
b, (2x+4).8-40=24
(2x+4).8=24+40
(2x+4).8=64
2x+4=64:8
2x+4=8
2x=8-4
2x=4
x=4:2=2
c, (2x+42)-25=64:24
(2x+16)-32=64:16
(2x+16)-32=4
2x+16=4+32
2x+16=36
2x=36-16
2x=20
x=20:2=10
d, 95-x=45
x=95-45=50
e, (2x+13)-2=47-17
(2x+13)-2=30
2x+13=30+2
2x+13=32
2x=32-13
2x=19
x=19:2=9,5
g, (2x+32)-8=50:2
(2x+9)-8=25
2x+9=25+8
2x+9=33
2x=33-9
2x=24
x=24:2=12