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a) 4.52-3.23 = 22.52-3.23 = 22.(52-3.2) =22.(25-6) = 4.19 = 76
b) 28.76 + 13.28 + 9.2
= 28. (76 + 13) + 18
= 28. 89 + 18
= 2492 + 18
= 2510
c) 1024: ( 17 .25+15.25)
= 210 : [25.(17+15)]
= 210: [25. 32]
= 210: [25.25)
= 210:210
= 1
a) 4.52-3.23
=22.52-3.23
=22.(25-6)
=4.11
=44
b) 28.76+13.28+9.2
=28.(76+13)+9.2
=28.89+9.2
=2.(1246+9)
=2.1255
=2510
c) 1024:(17.25+15.25)
=1024:25.(17+15)
=1024:32.32
=1
a, 3.5^2+15.2^2-26:2
=3.25+15.4-13
=75+60-13
=135-13
=122
b, 5^3.2-100:4+2^3.5
=125.2-25+8.5
=250-25+40
=225+40
=265
\(A=1024:\left(17.2^5+15.2^5\right)\)
\(=1024:\left[2^5.\left(17+15\right)\right]\)
\(=1024:\left[32.32\right]\)
\(=1\)
\(A=\frac{1024}{17.2^5+15.2^5}=\frac{1024}{2^5.\left(17+15\right)}=\frac{1024}{32.32}=\frac{1024}{1024}=1\)
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
a/ 25.85+15.25=25(85+25)=25.110=2750
b/ 2048 : (17.2^5 +15. 2^5)= 2048 : [2^5 ( 17+15)]=2048 : ( 32. 32) = 2048 : 1024 = 2
1024:(26:25+42:4)
=1024 : ( 26-5+42-1 )
=1024 : ( 2+4 )
=1024:6 = 512/3
!!!!
a)2^3.17-14+2^3.3^2
=8.17-14+8.9
=136-14+72
=194
b)102-272+|-15|-23
=-170+15-23
=-178
c)95:93 -32.3
=92-3
=78
a) 23 . 17 - 14 + 23 . 32
= 23 . ( 17 + 32 ) - 14
= 8 . ( 17 + 9 ) - 14
= 8 . 26 - 14
= 208 - 14
= 194
b) 102 - 272 + |-15| + (-23)
= 102 - 272 + 15 - 23
= - 170 + 15 - 23
= - 155 - 23
= - 178
c) 95 : 93 - 32 . 3
= 92 - 33
= 81 - 27
= 54
\(a)\frac{1024}{17\cdot2^5+15\cdot2^5}=\frac{1024}{(17+15)\cdot2^5}=\frac{1024}{32\cdot32}=\frac{1024}{1024}=1\)
\(b)2^2\cdot102-2^3\cdot17-2^2\cdot34=2^2\cdot(102-34)-2^3\cdot17\)
\(=4\cdot68-8\cdot17\)
\(=272-136=136\)
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