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\(4.5^2+3:71^0-54:3^3\\ =4.25+3:1-54:27\\ =100+3-2=101\)
\(2\cdot25+3:71^0-54:3^3\)
\(=50+3:1-54:27\)
\(=50+3-2\)
\(=51\)
Chúc bn hok tốt
a) 12 : { 400 : [500 – (125 + 25 . 7)]}
=12 : { 400 : [500 – (125 + 175)]}
=12 : [ 400 : [500 – 300)]
=12 : (400:200)
=12:2=6
b) 5 . 22 – 18 : 3
=5.4-6
=20-6=14
c) 18 : 3 + 182 + 3.(51 : 17)
=5+182+3.3
=187+9=196
d) 25 . 8 – 12.5 + 170 : 17 – 8
=200-60+10-8
=142
e) 2.52+ 3: 710 – 54: 33
=2.25+3:1-54:27
=50+3-2
=51
f) 189 + 73 + 211 + 127
=(189+211)+(73+127)
=400+200=600
g) 375 : {32 – [ 4 + (5. 32– 42)]} – 14 )
=375 : {32 – [ 4 + (160– 42)]} – 14 )
=375 : [32 – ( 4 + 118) – 14 ]
=375:(32-122-14)
=375:-104
=-375/104
h) (52022 + 52021) : 52021
=(52022:52021)+(52021:52021)
=5+1=6
\(5.2^2-18:3\)
\(=5.4-18:3\)
\(=20-6=14\)
\(2^3.17-2^3.14\)
\(=8.17-8.14\)
\(=8.\left(17-14\right)\)
\(=8.3\)
\(=24\)
\(75-\left(3.5^2-4.2^3\right)\)
\(=75-\left(3.25-4.8\right)\)
\(=75-\left(75-32\right)\)
\(=75-43\)
\(=32\)
\(150+50:5-2.3^2\)
\(=150+50:5-2.9\)
\(=150+10-18\)
\(=142\)
#Rảnh
a) 34 . 54-34 . 540
=3^4.(54-54^0)
=3^4.(54.1)
=81.54=4374
a) \(123+\left[54+\left(-123\right)+46\right]\)
\(=123+54+\left(-123\right)+46\)
\(=54+46\)
\(=100\)
b) \(-64+\left[\left(-111\right)+64+71\right]\)
\(=-64+\left(-111\right)+64+71\)
\(=\left(-111\right)+71\)
\(=-40\)
3/2.5 + ...+ 3/17 .20
= 3/2 .(1/2 - 1/5 + 1/5 - 1/8 + ... + 1/17 - 120)
= 3/2 . (1/2 - 1/20)
= \(\frac{3}{2}\) . \(\frac{9}{20}\) = \(\frac{27}{40}\)
\(A=\frac{3^2}{2.5}+\frac{3^2}{5.8}+\frac{3^2}{8.11}=3.\left(\frac{3}{2.5}+\frac{3}{5.8}+\frac{3}{8.11}\right)\)
\(=3.\left(\frac{1}{2}-\frac{1}{5}+\frac{1}{5}-\frac{1}{8}+\frac{1}{8}-\frac{1}{11}\right)=3.\left(\frac{1}{2}-\frac{1}{11}\right)\)
\(=3.\left(\frac{11}{22}-\frac{2}{22}\right)=3.\frac{9}{22}=\frac{27}{22}\)
2.52 + 3 : 710 - 54 : 33
= 2.25 + 3 : 1 - 54 : 27
= 50 + 3 - 2
= 53 - 2
= 51
2×5^2+3÷71^0-54÷3^3
= 2×25+3÷1-54÷9
=50+3-6
=53-6
=47
Xin 5 sao