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a)
204-84:12
=204-7
=197
b)
15.23+4.32-5.7
=15.8+4.9-5.7
=120+36-35
=156-35
=121
c)
56:53+23.22
=56-3+23+2
=53+25
=125+32
=157
d)
164.53+47.164
=(164.(53+47)
=164.100
=16400
tìm x:
219-7(x+1)=100
=>7(x+1)=219-100
=>7(x+1)=119
=>x+1=119:7
=>x+1=17
=>x=17-1
=>x=16
(3x-6).3=34
=>(3x-6).3=81
=>3x-6=81:3
=>3x-6=27
=>3x=27+6
=>3x=33
=>x=33:3
=>x=11
204-84:2=204-42=162
15.23+4.32-5.7=15.8+4.9-35=120+36-35=121
56:53+23.22=15625:125+8.4=125+32=157
164.53+47.164=164.(53+47)=164.100=16400
HỌC TỐT.
\(5.2^2-18:3\)
\(=5.4-18:3\)
\(=20-6=14\)
\(2^3.17-2^3.14\)
\(=8.17-8.14\)
\(=8.\left(17-14\right)\)
\(=8.3\)
\(=24\)
\(75-\left(3.5^2-4.2^3\right)\)
\(=75-\left(3.25-4.8\right)\)
\(=75-\left(75-32\right)\)
\(=75-43\)
\(=32\)
\(150+50:5-2.3^2\)
\(=150+50:5-2.9\)
\(=150+10-18\)
\(=142\)
#Rảnh
\(1a,204-84:12\)
\(=204-4=200\)
\(b,15.2^3+4.3^2-5.7\)
\(=15.8+4.9-35\)
\(=120+36-35=121\)
\(c,5^6:5^3+2^3.2^2\)
\(=5^3+2^5=125+32=157\)
\(d,164.54+164.47\)
\(=164\left(54+46\right)+164\)
\(=164.100+164=16400+164=16564\)
a) 220 - [32 . 33 - (12 - 70) 2]
= 220 - [9 . 27 - (12 - 1)2]
= 220 - [9 . 27 - 112]
= 220 - [9 . 27 - 121]
= 220 - [243 - 121]
= 220 - 122
= 98
b) [504 - (52 . 8 + 70) : 33 + 6] : 125
= [504 - (25 . 8 + 70) : 27 + 6] : 125
= [504 - (200 + 70) : 27 + 6] :125
= [504 - 270 : 27 + 6] : 125
= [504 - 10 + 6] : 125
= [494 + 6] : 125
= 500 : 125
= 4
c) 27 . 23 + 4 . 32 - 5 . 120
= 27 . 8 + 4 . 9 - 5 . 1
= 216 + 36 - 5
= 252 - 5
= 247
d) 316 - (5. 2 . 22 + 24) : 23 - 3 . 23
= 316 - (5 . 2 . 4 + 16) : 8 - 3 . 8
= 316 - (40 + 16) : 8 - 3 . 8
= 316 - 56 : 8 - 3 . 8
= 316 - 7 - 3 . 8
= 316 - 7 - 24
= 309 - 24
= 285
mời bạn đừng thi thì tốt hơn 
\(5^2-\left(5.3^3-4.2^3\right).19=25-\left(135-32\right).19=25-103.19=25-1957=-1932\)
\(215-\left(5^2.2^3+700\right):3^2=215-\left(200+700\right):3^2=215-900:9=215-100=115\)
\(16.25+2^4.75=400+1200=1600\)
\(15.2^3+4.3^2-5.7=120+36-35=121\)
=212 nha cậu