Tính nhanh :
12 . 32 - 2 3 . ( 2015 0 + 1 3 )
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a. Ta có: 12 . 3 2 - 2 3 . ( 2015 0 + 1 3 ) = 12 . 9 - 8. ( 1+1)
= 108 - 8 . 2
= 108 - 16
= 92
b. Ta có: 175 - [ ( 32 - 23 ) . 5 -15 ] : 3 = 175 - ( 9 . 5 - 15 ) :3
= 175 - ( 45 - 15) : 3
= 175 - 30 : 3
= 175 - 10
= 165
Ta có : 12.32 - 23 . ( 20150 + 13 )
= 12. 9 - 8 . ( 1 + 1 )
= 12 . 9 - 8 . 2
= 6.2 . 9 - 8 . 2
= 2 . ( 6 . 9 - 8 )
= 2 . ( 54 - 8 )
= 2 . 46
= 92
12.32-23.(20150+13)
=12.32-23.(1+1)
=12.32-23.2
=12.32-24
=12.9-16
=108-16
=92
nho k ch mk nha
\(\frac{12}{15}\times\frac{22}{47}+\frac{25}{47}:\frac{15}{12}\)
\(\frac{12}{15}\times\frac{22}{47}+\frac{25}{47}\times\frac{12}{15}\)
\(=\frac{12}{15}\times\left(\frac{22}{47}+\frac{25}{47}\right)\)
\(=\frac{12}{15}\times\frac{22+25}{47}\)
\(=\frac{12}{15}\times1=\frac{12}{15}\)
1) 9 x 10 + 10 x 11 + 11 x 12 + ....+ 2015 x 2016
=9x10x11-8x9x10+10x11x12-9x10x11+...+2015x2016x2017-2014x2015x2013
=2015x2016x2017-8x9x10
=8193537360
Bài 1: a,\(\frac{5}{6}+\frac{7}{8}=\frac{5\times4}{6\times4}+\frac{7\times3}{8\times3}=\frac{20+21}{24}=\frac{41}{24}\)
b,\(\frac{5}{8}-\frac{2}{5}=\frac{5\times5}{8\times5}-\frac{2\times8}{5\times8}=\frac{25}{40}-\frac{16}{40}=\frac{25-16}{40}=\frac{9}{40}\)
c,\(\frac{9}{10}\times\frac{5}{6}=\frac{9\times5}{10\times6}=\frac{3\times3\times5}{2\times5\times2\times3}=\frac{3}{2\times2}=\frac{3}{4}\)
d,\(\frac{6}{5}:\frac{3}{7}=\frac{6}{5}\times\frac{7}{3}=\frac{6\times7}{5\times3}=\frac{2\times3\times7}{5\times3}=\frac{2\times7}{5}=\frac{14}{5}\)
Bài 2:\(\frac{7}{2}=\frac{7\times5}{2\times5}=\frac{35}{10}\)
7 . (-2)^3 - 60:15
= 7 . (-8) - 4
= (-56)- 4
= - 60
125 - (-75) + 32 - (48 + 32)
= 125-75 + 32 - 48 -32
= 50 + (-48)
=2
1 Tính nhanh
a) \(-14+12+\left(-12\right)\left(2^3-7\right)\)
\(=-14+\left[12+\left(-12\right)\right].1\)
\(=-14+0.1\)
\(=-14+0=-14\)
b) \(\left(-5\right)+2\left(-15\right)-\left(-3\right)+\left|-10\right|\)
\(=\left(-5\right)+\left(-30\right)-\left(-3\right)+10\)
\(=\left(-35\right)-\left(-3\right)+10\)
\(=\left(-32\right)+10\)
\(=-22\)
c) \(68.\left(12+32\right)-32.\left(68-12\right)\)
\(=68.44-32.56\)
\(=2992-1792\)
\(=1200\)
d) \(89-\left(-43\right)-32\)
\(=132-32\)
\(=100\)
e) \(-12.\left(-6\right)^2+\left(-4\right)^3.12\)
\(=-12.36+64.12\)
\(=\left(-12+12\right).\left(36+64\right)\)
\(=0+100\)
\(=100\)
Tính nhanh :
12.32 - 23 .(20150 + 13)
=22.3.32 - 23 .(1+1)
=22 . 33 - 23 .2
=22(33 -22)
=4.23=92
12.32-23.(20150+13)
=12.32-23.(1+1)
=12.32-23.2
=12.32-24
=12.9.16
=1728
#chúc bạn học tốt#
nhớ k mk nhé!!!