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a. 215 - 5 + 10 = 210 + 10 = 220
b. 13 + (-17) = -4
c. 25 . 5 . 2014 . 4 . 2 = (25 . 4) . (5 . 2) . 2014 = 100 . 10 . 2014 = 1000 . 2014 = 2014000
đ. 24.35 + 76.35 - 500 = (24 + 76) . 35 - 500 = 100 . 35 - 500 = 3500 - 500 = 3000
e. 3 + 7 + 11 + 15 + ... + 399 + 403 = 406 . 101 : 2 = 20503
a) A = 37. 173 +62. 173 + 173
= 173. (37 +62 + 1)
= 173.100
= 17 300
b) B = 72.99 + 28.99 - 900
= 99. (72+28) - 900
= 99.100 - 900
= 9 900 - 900
= 9 000
c) C = 23.3-(110 + 15): 42
= 8.3 - (1 + 15): 42
= 8.3 - 16:42
= 8.3 - 1
= 23.
d) D = 62: 4.3 + 2.52 - 2010
= 36:4.3 + 2.25 - 1
= 27 + 50 - 1
= 76.
a, 15 . { 32 : [ 6 - 5 + 5 ( 9 : 3 ) ] + 3 } - 2018 0
= 15.{32:[1+15]+3}–1
= 15.5–1
= 74
b, 25 . { 2 7 : [ 12 - 4 + 2 2 . 16 : 2 3 ] - 2 4 }
= 25.{128:[8+4.2]–16}
= 25.24
= 600
c, 2019 . { 101 - 1000 : [ 2 2 . 2 3 + 5 6 : 5 3 - 6 2 : 11 - 2018 0 ] }
= 2019.{101–1000:[(32+125–36):11–1]}
= 2019.{101–1000:[121:11–1]}
= 2019.{101–1000:10}
= 2019.1
= 2019
\(a.=24+42+120-24-42\)
\(=\left(24-24\right)+\left(42-42\right)+120\)
\(=0+0+120\)
\(=120\)
\(b.=13-145+49-13-49\)
\(=\left(13-13\right)+\left(49-49\right)-145\)
\(=0+0-145\)
\(=-145\)
\(a,2^2=4,2^3=8,2^4=16,2^5=32,2^6=64,2^7=128,2^8=256,2^9=512,2^{10}=1024\)
\(b,3^2=9,3^3=27,3^4=81,3^5=243\)
\(c,4^2=16,4^3=64,4^4=256\)
\(d,5^2=25,5^3=125,5^4=625\)
a) 50+3x(25-16)2+150
=50+3x92+1
=50+3x81+1
=50+243+1
=294
b)22x52-35/32
=(2x5)2-35-2
=102-33
=100-27
=73
c)80-[130-(12-4)2 ]
=80-[130-82 ]
=80-[130-64]
=80-66
=14
d)100:[2x(52-35-8)]
=100:[2x9]
=100:18
=100/18
e)24:{300:[375-(150+15x5)]}
=24:{300:[375-(150+75)]}
=24:{300:[375-225]}
=24:{300:50}
=24:6
=4
Bài làm:
\(A=\frac{4^2}{15}.\frac{5^2}{24}.\frac{6^2}{35}.....\frac{20^2}{399}=\frac{4^2}{3.5}.\frac{5^2}{4.6}.\frac{6^2}{5.7}.....\frac{20^2}{19.21}=\frac{\left(4.5.6.....20\right)\left(4.5.6.....20\right)}{\left(3.4.5.....19\right)\left(5.6.7.....21\right)}=\frac{20.4}{3.21}=\frac{80}{63}\)
Học tốt!!!!