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Bài 2 :
a, \(3.4.25.8.125=3.100.1000=300000\)
b, \(36.63+64.63=63\left(36+64\right)=63.100=6300\)
c, \(45.129+71.45=45\left(129+71\right)=45.200=9000\)\
d, \(26\left(43+57\right)+74\left(57+43\right)=26.100+74.100=2600+7400=100000\)
Bài 5 :
a, \(2\left(x-5\right)=0\Leftrightarrow2x-10=0\Leftrightarrow x=5\)
b, \(12\left(x-35\right)=0\Leftrightarrow12x-420=0\Leftrightarrow x=35\)
c, \(\left(x-10\right)\left(x-13\right)=0\Leftrightarrow\orbr{\begin{cases}x=10\\x=13\end{cases}}\)
a,(38-129+43)-(43+38)=38-129+43-43-38=(38-38)+(43-43)-129=-129
b,-144-[29-(+144)-(-144)=-144-29+144-144=(144-144)-29-144=-173
c)48+|48-174|+(-74)=18+126-74=70
d)(-123+77)-(277-23-123)=-123+77-277+23+123=(-123+123)+(77-277)+23=-200+23=-177
e)-(-57-159)+(43-169)=57+129+43-169=(57+43)+(129-169)=100-40=60
Chúc bạn học tốt( sai chỗ nào cho mjk sr nka??) k cho mjk nka
a] 57 + 26 + 24 + 63
=( 57+63 )+ ( 26 + 24 )
=120 +50
=170
b) 24 + 25 + 26+27+28 + 29 + 30 + 31
=( 24+ 31) x ( 31-24 ) +1 : 2
=55 x 4
=220
c) 199 + 36 + 201 + 184 + 37
= ( 199 + 201 ) + ( 36 + 184 ) + 37
= 400 + 220 + 37
=657
d) 2 + 4 + 6 + 8 + 10 +.......+ 100
=( 100 + 2 ) x ( 100-2 ) : 2 + 1 : 2
= 102 x 25
=2550
Tk cho mk nha tk ai tk mk kb cho
a) = 57 + 63 + 26 + 24
= 120 + 50
= 170 ( có nhanh ko ta?! làm theo quán tính hoy)
b) = (31+24) \(\times\)8: 2
= 220
c) = 199 + 201+ 36+ 184 + 37
= 400+ 220 + 37
= 657
d) SSH= ( 100-2) : 2 + 1= 47
Tổng= (100+2) \(\times\)47: 2= 2397
check bạn nha!!! ^^
\(27.332+93.43+57.61+69.57\\ =27.332+93.43+57.\left(61+69\right)\\ =27.332+93.43+57.130\\ =8964+3999+7410=20373\\ 34.75+75.66-65.100\\ =\left(34+66\right).75-65.100\\ =100.75-65.100\\ =100.\left(75-65\right)\\ =100.10=1000\\ \left(456.11+912\right).37:13:74\\ =5928:13:\left(74:37\right)\\ =456:2=228\\ 6^2:4.3+2.5^2\\ =36:4.3+2.25\\ =9.3+50=27+50=77\\ 5.4^2-18:3^2\\ =5.16-18:9\\ =80-2=78\\\left[\left(315+372\right).3+\left(372+315\right).7\right]:\left(26.13+74.14\right)\\ =687.\left(3+7\right):\left(338+1036\right)\\ 687.10:1374\\ =6870:1374=5\\ 12:\left\{390:\left[500-\left(125+35.7\right)\right]\right\}\\ =12:\left[390:\left(500-370\right)\right]\\ =12:\left(390:130\right)=12:3=4\\ 192000-\left(1500.2+1800.3+1800.2:3\right)\\ =192000-\left(3000+5400+1200\right)\\ =192000-9600=182400\)
???????????????????????????????????????????????????????????????????????????????????????
a) \(\left(-17\right)\cdot32+17\cdot\left(-68\right)-17\)
\(=17\cdot\left(-32-68-1\right)\)
\(=17\cdot\left(-101\right)\)
\(=17\cdot\left(-100-1\right)\)
\(=-1700-17\)
\(=-1717\)
b) \(25\cdot\left(34-89\right)+25\cdot89\)
\(=25\cdot\left(34-89+89\right)\)
\(=25\cdot34\)
\(=850\)
c) \(-145\cdot\left(13-57\right)+57\cdot\left(10-145\right)\)
\(=-145\cdot13+145\cdot57+57\cdot10-145\cdot57\)
\(=-145\cdot\left(13+57\right)+57\cdot\left(145+10\right)\)
\(=-145\cdot70+57\cdot155\)
\(=-10150+8835\)
\(=-1315\)
`@` `\text {Ans}`
`\downarrow`
`a)`
\((- 17) . 32 + 17 . (- 68) – 17 \)
`= (-17). (32 + 68 + 1) `
`= (-17). 101`
`= -1717`
`b)`
\(25 . (34 – 89) + 25 . 89\)
`= 25. (34 - 89 + 89)`
`= 25. 34`
`= 850`
`c)`
\(– 145. (13 – 57) + 57. (10 – 145)\)
`= (-145). 13 - (-145). 57 + 57.10 + 57. (-145)`
`= (-145). (13 - 57 + 57) + 57.10`
`= (-145). 13 + 570`
`= -1885 + 570 = -1315`
a, A = 2 10 - 2 5 = 1024 - 32 = 992
b, B = 4 3 - 4 2 - 4 = 64 - 16 - 4 = 44
c, C = 3 2 . 2 3 + 4 3 . 2 5 = 9.8 + 64.32 = 2120
d, D = 1 3 + 2 3 + 3 3 + 4 3 + 5 3 = 1 + 8 + 27 + 64 + 125 = 225
a) A = 2 10 - 2 5 = 1024 - 32 = 992 .
b) B = 4 3 - 4 2 - 4 = 64 - 16 - 4 = 44 .
c) C = 3 2 . 2 3 + 4 3 . 2 5 = 9 . 8 + 64 . 32 = 2120 .
d) D = 1 3 + 2 3 + 3 3 + 4 3 + 5 3 = 1 + 8 + 27 + 64 + 125 = 225
a) \(3\cdot4\cdot25\cdot8\cdot125\)
\(=\left(125\cdot8\right)\cdot\left(4\cdot25\right)\cdot3\)
\(=1000\cdot100\cdot3\)
\(=300000\)
b) \(36\cdot63+64\cdot663\)
\(=63\cdot\left(36+64\right)\)
\(=63\cdot100\)
\(=6300\)
c) \(45\cdot129+71\cdot129\)
\(=129\cdot\left(129+71\right)\)
\(=129\cdot200\)
\(=25800\)
d) \(26\cdot\left(43+57\right)+74\cdot\left(43+57\right)\)
\(=26\cdot100+74\cdot100\)
\(=2600+7400\)
\(=10100\)
a) 3.4.25.8.125
=3(4.25).(8.125)
=3.100.1000
300000
b) 36.63+ 64.63
=(36+64).63
=100.63
=6300
c) 45.129+ 71.45
=45.(129+71)
=45.200
=9000
d) 26. (43+ 57)+ 74(57 +43)
=26.43+26.57 + 74.57 + 74.43
=(26.43+74.43)+(26.57 + 74.57 )
= [43.(26+74)]+[ (26+74).57]
=[43.100]+[100.57]
=4300+5700
= 10000