33x1234-2345+12
(1/3+3/4-13/12):(12/23+123/234+1234/2345)
0 : 999 x 9 + 2345 - 567 : 12 - 678=
2345 - 1000 : [19 - 2 . [ 21 - 12 ] ]
2345 - 1000 : [ 19 - 2 . [ 21 - 12 ) ]
= 2345 - 1000 : [ 19 - 2 . 9 ]
= 2345 - 1000 : [ 19 - 18 ]
= 2345 - 1000 : 1
= 2345 - 1000
= 1345
a)-6/35 :-54/39
b)-5/7x2/11+-5/7x9/11+12/7
c)(1/2+3/4-13/12) :(12/23+123/234+1234/2345)
a: =6/35x39/54=13/105
b: \(=\dfrac{-5}{7}\left(\dfrac{2}{11}+\dfrac{9}{11}\right)+\dfrac{12}{7}=\dfrac{-5}{7}+\dfrac{12}{7}=1\)
2345*55+2345+2345*20+2345*24
`2345 xx 55 + 2345 + 2345 xx 20 + 2345 xx 24`
`= 2345 xx ( 55 + 1 + 20 + 24 )`
`= 2345 xx 100`
`= 234500`
1+2+3+4+5+6+7+8+9+10+11+12+13+14+151+2345+123
tổng là
2724
đáp số 2724
máy tính tính không thể sai đâu
Tính nhanh
(1/3+3/4+13/14):(12/23+123/234+1234/2345)
2345*25+2345*74+2345
2345x25+2345x74+2345
=2345x(25+74+1)
=2345x100
=234500
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2345 x 25 + 2345 x 74 + 2345
= 2345 x 25 + 2345 x 74 + 2345 x 1
= 2345 x ( 25 + 74 + 1)
= 2345 x 100
= 234500
nam 2k6 trở xuống ch có ny lm quen đi nào...
123456-2345+12=??