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\(27.77+24.27-27\)
\(=27.\left(77+24-1\right)\)
\(=27.100\)
\(=2700\)
\(174\div\left\{2\left[36+\left(4^2-23\right)\right]\right\}\)
\(=174\div\left\{2\left[36+\left(16-23\right)\right]\right\}\)
\(=174\div\left\{2\left[36+\left(-7\right)\right]\right\}\)
\(=174\div\left\{2.29\right\}\)
\(=174\div58\)
\(=3\)
\(3^2.4-\left[30-\left(5-2\right)^2\right]\)
\(=9.4-\left[30-3^2\right]\)
\(=36-\left[30-9\right]\)
\(=36-21\)
\(=15\)
a)27*77+24*27-27=27*(77+24-1)=27*100=2700
b)(-12)+(-9)+121+|-20|=-21+121+20=100+20=120
c)25*101-25*1010=25*101-25*1=25*(101-1)=32*100=3200
a) \(17\cdot85+15\cdot17-120\)
\(=17\cdot\left(85+15\right)-120\)
\(=17\cdot100-120\)
\(=1700-120\)
\(=1580\)
b) \(27\cdot77+24\cdot27-27\)
\(=27\cdot\left(77+24-1\right)\)
\(=27\cdot100\)
\(=2700\)
a) 17.13+17.42-17.35
=17.(13+42-35)
=17.20=340
b) [25.(18-42)-10]:4+6
=(25.2-10):4+6
=40:4+6=16
c) 36:32+23.22-32.3
=34+25-33
=81+32-27=86
d) B=3.42-22.3
=3.(16-4)
=3.12=36
e)20220+3.[52.10-(23-13)2]
=1+3.(250-100)
=1+450=451
g) 27.77+24.27-27
=27.(77+24-1)
=27.100=2700
h) 5.23+79:77-12020
=40+72-1
=89-1=88
i) 120:{54[50:2+(32-2.4)]}
=120:[54(25+1)]
=120:1404=10/117
a) 27.77+24.27-27
= 27.77+24.27-27.1
= 27.(77+24-1)
=27.
chúc bạn học tốt
27 . 77 + 77 - 27
= ( 27 - 27 ) .77 + 24
= 0 . 77 + 24
= 0 + 24
= 24
1)69.24+69.120+144.31
= 69. (24+120) + 144.31
= 144.69 + 144.31
= 144. (69+31)
= 144.100
=14 400
2)95.103-95.2-95
= 95. (103-2-1)
= 95.100
= 9 500
4)47.62+31.106
= 47. 62+ (31.2). 53
= 47.62 + 62. 53
= 62. (47+53)
= 62.100
= 6 200
5) 54.12+27.77-27
= 27. (2.12) + 27.77 - 27.1
= 27. 24 + 27.77 - 27.1
= 27. (24+77-1)
= 27. 100
= 2 700
6) 49+215+51+83+85
= (49+51) + (215+85)+ 83
= 100 +300 + 83
= 483
27. 77 + 24 . 27 - 27
= 27 . (77 + 24 - 1)
= 77 . 100
= 7700
Chúc bạn học tốt!
=2700
mk nha