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17 . 85 + 17 . 15 + 300
= 17 . ( 85 + 15 ) + 300
= 17 . 100 + 300
= 1 700 + 300
= 1 400
72 . 121 + 27 . 121 + 121
= 121 . ( 72 + 27 + 1 )
= 121 . 100
= 12 100
32 . 39 + 52 . 21 - 12 . 39 + 21 . 48
= 39 . ( 32 - 12 ) + 21 . ( 52 + 48 )
= 39 . 20 + 21 . 100
= 780 + 2 100
= 9 900
a.=17*(85+15)+300
=17*100+300
=1700+300=2000
b.=121*(72+27+1)
=121*100=12100
c.chịu
a, 75 + 58.50 – 58.25 = 3.25 + 58.(50 – 25) = 3.25 + 58.25 = 25.(3+58) = 25.61 = 1525
Ta có: 1525 = 5 2 . 61
b, 20: 2 2 – 5 9 : 5 8 = 20:4 – 5 = 5 – 5 = 0
c, 5 19 : 5 17 - 4 : 7 = 5 2 - 4 : 7 = (25 – 4):7 = 3
d, 47 - 45 . 2 4 - 5 2 . 12 : 14 = 47 – (45.16 – 25.12):14 = 47 – (720 – 300):14 = 47 – 420:14 = 47 – 30 = 17
e, 10 2 : 60 : 5 6 : 5 4 - 3 . 5 = 100 – 60: 5 2 - 15 = 100 – 60:(25 – 15) = 100 – 60:10 = 100 – 6 = 94
Ta có: 94 = 2.47
f, 2345 - 1000 : 19 - 2 21 - 18 2 = 2345 – 1000:(19 – 2. 3 2 ) = 2345 – 1000:(19 – 2.9) = 2345 – 1000:(19 – 18) = 2345 – 1000:1 = 2345 – 1000 = 1345
Ta có: 1345 = 3.269
g, 500 – {5.[409 – 2 3 . 3 - 21 2 ]+ 10 3 }:15 = 500 – {5.[409 – 8 . 3 - 21 2 ]+1000}:15 = 500 – {5.[409 – 3 2 ]+1000}:15 = 500 – {5.(409 – 9)+1000}:15 = 500 – {5.400+1000}:15 = 500 – (2000+1000):15 = 500 – 3000:15 = 500 – 200 = 300
Ta có: 300 = 2 2 . 3 . 5 2
h, 967 – [8 + 2 . 3 2 – 24:6 + 9 - 7 3 ].5 = 967 – [8+2.9 – 4+8].5 = 967 – 30.5 = 967 – 150 = 817
Ta có: 817 = 19.43
bài này dễ mà bạn bạn chỉ cần đổi ra rồi tính bình thường là đc mà
Bài 1:
\(A=2^2\cdot3-4\\ =4\cdot3-4\\ =4\cdot\left(3-1\right)\\ =4\cdot2\\ =8\\ B=16-2^3\cdot2\\ =16-16\\ =0\\ C=4^2-4\cdot2\\ =4\cdot\left(4-2\right)\\ =4\cdot2\\ =8\\ D=3^3-3\cdot3^2\\ =3^3-3^3\\ =0\)
a) \(3.5^2-16:2^2\)
\(=3.25-16.4\)
\(=75-64\)
\(=11\)
b) \(17.85+15.17-120\)
\(=17.\left(85+15\right)-120\)
\(=17.100-120\)
\(=1700-120\)
\(=1580\)
c) \(\left(3^{15}.4+5.3^{15}\right):3^{16}\)
\(=\left[3^{15}.\left(4+5\right)\right]:3^{16}\)
\(=\left[3^{15}.9\right]:3^{16}\)
\(=\left[3^{15}.3^2\right]:3^{16}\)
\(=3^{17}:3^{16}\)
\(=3\)
a. 3.52 - 24 : 22 = 3.52- 22 = 3.25-4= 75-4 =71
b. 17.(85+15) - 120 = 17.100-120=1700-120=1580
c. |315.(4+5)| :316= (315.9) : 316= 315.32 : 316= 317:316=3
dấu | là ngoặc vuông bn nhé
a: 785+135-85+65
=785-85+135+65
=700+200
=900
b: \(32\cdot39+52\cdot21-12\cdot39+21\cdot48\)
\(=39\cdot32-12\cdot39+52\cdot21+21\cdot48\)
\(=39\left(32-12\right)+21\left(52+48\right)\)
\(=39\cdot20+21\cdot100=2100+780=2880\)
c: \(5^4\cdot5^8:5^9\cdot6\cdot8\cdot7\)
\(=\dfrac{5^{12}}{5^9}\cdot48\cdot7\)
\(=125\cdot48\cdot7=42000\)
d: \(2021^0-\left\{15^2:\left[175+\left(2^3\cdot5^2-6\cdot25\right)\right]\right\}\)
\(=1-\dfrac{225}{175+8\cdot25-150}\)
\(=1-\dfrac{225}{25+220}\)
=1-1
=0
a) 785 + 135 - 85 + 65 = 900
b) 32.39 + 52.21 - 12.39 + 21.48 = 93.69
c) 5 mũ 4.5 mũ 8 ÷ 5 mũ 9.6 ÷ 8.7 = 0.134
d) 2021 mũ 0 - { 15 mũ 2 : [ 175 + ( 2 mũ 3.5 mũ 2 - 6.25 ) ] } = 2021 mũ 0 - { 152 : [ 175 + 17.27 ] } = 20210 - { 152 : 192.27 } = 20210 - 0.791 = 20209.209
a) 17. 85 + 15 . 17 = 300
= 17. 9 85 = 15) + 300
= 2000
b) 72. 121 + 27 .121 = 121
= 121 . ( 72 + 27 = 1)
= 12100
c) 32. 39 + 52 . 21 - 12 . 39 + 21 . 48
= ( 32 - 12).39 + 21. ( 52 + 48)
= 2880
d) 47 - ( 45.24 - 52.12) : 14
= 47 - ( 45 . 16 - 25.12) : 14
= 17
e) 102 - 60 : ( 54 : 52 - 3. 5)
= 100 - 60 : ( 25 - 15)
= 100 - 6
= 94