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a) = ( -24 + -8) + 36 -7 = ( -32) +36 - 7 = 4-7=-3
b) = 182 - 71 + 58 + 171 - 82= ( 182 - 82 ) + ( -71 + 171) + 58 = 100 +100+58=258
c) = 5612 + 44 - 158 - 612 - 344 + 58 = ( 5612 - 612) + (44 - 344)+ ( -158 + 58) = 5000 + ( - 300) + ( - 100) = 4600
d) = ( -8 . -125 ) . 7 . ( - 9) = -1000 .7 . ( - 9) = 63000
e) = -72 . ( 39 + 11) = - 72.50 = - 3600
~ chúc bn học toots~ # Q.Trang #
a) [ ( -24 ) + ( -8 ) ] + ( -6 )2 - 7
=-32 + 36 - 7
= 4 - 7
= -3
b) ( 182 - 71 + 58 ) + ( 171 - 82 )
=182 - 71 + 58 + 171 - 82
=(182-82) + (-71+171) + 58
=100 + 100 + 58
=200 + 58
=258
c) ( 5612 + 44 - 158 ) - ( 612 + 344 - 58 )
=5612 + 44 - 158 - 612 - 344 + 58
=(5612-621) + ( 44-344) + (-158+58)
=5000 + (-300) + (-100)
=-4700 + (-100)
=-4800
d) ( -8 ) . 7 . ( -125 ) . ( -9 )
=[-8 . (-125)] . [ 7 . (-9)]
=1000.(-63)
=-63000
e) 72 . ( -39 ) + 11 . ( -72 )
=72 . (-39) - 11 . 72
=72 . (-39 - 72)
=72 . (-111)
=-7992
A=4+12+24+40+...+19404+19800
1/2A=2+6+12+...+9702+9900
1/2A=1.2+2.3+3.4+...+98.99+99.100
3/2A=1.2,3+2.3.(4-1)+3.4.(5-2)+...+98.99.(100-97)+99.100.(101-98)
3/2A=1.2.3+2.3.4-1.2.3+3.4.5-2.3.4+...+98.99.100-97.98.99+99.100.101-98.99.100
3/2A=99.100.101
A=(99.100.101):3/2=666600
B= 1+3+6+10+....+4851+4950
2B = 2+6+12+20+...+9702+9900
2B = 1.2+2.3+3.4+4.5+...+98.99+99.100
Xét A = 1.2+2.3+3.4+4.5+...+98.99+99.100
3A = 1.2.3+2.3(4-1)+3.4(5-2)+....+99.100(101-98)
3A = 1.2.3+2.3.4-1.2.3+3.4.5-2.3.4+....+99.100.101-98.99.100
3A = 99.100.101
B = 333300
Thay A vào B ta được:
2B = 333300
B = 166650
MK chỉ làm được đến đây thôi
a,5200
b, -4800
c,-4700
d,52400
e,37
sorry nha,mk ko giải ra đc
bn thông cảm
\(a,\left(5318-46+151\right)-\left(318-146+51\right)\)
\(=5318-46+151-318+146-51\)
\(=5000+100+100=5200\)
\(b,48.154-48.254\)
\(=48.\left(154-254\right)\)
\(=48.\left(-100\right)=-4800\)
a) ( 5318 - 46 + 151 ) - ( 318 - 146 + 51 )
=5318-46+151-318+146-51
=(5318-318)+(151-51)+(-46+146)
=5000+100+100
=5200
b) 48 . 154 - 254 . 48
=48.(154-254)
=48.(-100)
=-4800
c) 47 . ( -69 ) + 31 . ( -47 )
= 47. ( -69 ) + ( -31 ) .47
= 47. [ -69 + (-31)]
= 47.(-100)
=-4700
d) ( -524 ) . [ 23 + ( -45 ) ] + 524 . ( -45 + 123 )
= -524 . (-22)+524.78
= 524.22+524.78
= 524.(22+78)
= 524.100
= 52400
e) ( -5 )3 + 2 . ( -3 )4
= -125 + 2 . 81
= -125 + 162
= 37
\(e,\left(-5\right)^3+2.\left(-3\right)^4\)
\(=-125+2.81=-125+162\)
\(=162-125=37\)
\(d,-524.\left[23+\left(-45\right)\right]+524.\left(-45+123\right)\)
\(=524.\left[-23+45\right]+524.\left(-45+123\right)\)
\(=524.22+524.78\)
\(=574.\left(22+78\right)=574.100=57400\)
\(c,47.\left(-69\right)+31.\left(-47\right)\)
\(=-47.69+31.\left(-47\right)\)
\(=-47.\left(69+31\right)=-47.100=-4700\)
a) Đặt \(A=\left(5318-46+151\right)-\left(318-146+51\right)\)
- Ta có: \(A=\left(5318-46+151\right)-\left(318-146+51\right)\)
\(\Leftrightarrow A=5318-46+151-318+146-51\)
\(\Leftrightarrow A=\left(5318-318\right)+\left(151-51\right)+\left(146-46\right)\)
\(\Leftrightarrow A=5000+100+100\)
\(\Leftrightarrow A=5200\)
Vậy \(A=5200\)
b) Đặt \(B=48.154-254.48\)
- Ta có: \(B=48.154-254.48\)
\(\Leftrightarrow B=48.\left(154-254\right)\)
\(\Leftrightarrow B=48.\left(-100\right)\)
\(\Leftrightarrow B=-4800\)
Vậy \(B=-4800\)
c) Đặt \(C=47.\left(-69\right)+31.\left(-47\right)\)
- Ta có: \(C=47.\left(-69\right)+\left(-31\right).47\)
\(\Leftrightarrow C=47.\left[\left(-69\right)+\left(-31\right)\right]\)
\(\Leftrightarrow C=47.\left(-100\right)\)
\(\Leftrightarrow C=-4700\)
Vậy \(C=-4700\)
d) Đặt \(D=\left(-524.\right).\left[23+\left(-45\right)\right]+524.\left(-45+123\right)\)
- Ta có: \(D=524.-\left[23+\left(-45\right)\right]+524.\left(-45+123\right)\)
\(\Leftrightarrow D=524.\left[-\left(-45+23\right)+\left(-45+123\right)\right]\)
\(\Leftrightarrow D=524.\left(45-23-45+123\right)\)
\(\Leftrightarrow D=524.100\)
\(\Leftrightarrow D=52400\)
Vậy \(D=52400\)
e) Đặt \(E=\left(-5\right)^3+2.\left(-3\right)^4\)
- Ta có: \(E=\left(-5\right)^3+2.\left(-3\right)^4\)
\(\Leftrightarrow E=-125+2.81\)
\(\Leftrightarrow E=162-125\)
\(\Leftrightarrow E=37\)
Vậy \(E=37\)
Các bạn chỉ cho mình là mình sai chỗ nào đi ??????