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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
A)
=36:4.3+2.25
=9.3+50
=27+50
=77
B)
=5.16-18:9
=80-2
=78
Ủng hộ nhé! Ngồi nãy giờ mà ko đc j cả huhu :(
a, \(3^4\div3^2-\left[120-\left(2^6.2+5^2.2\right)\right]\)
\(=3^2-\left\{120-\text{[}2.\left(2^6+5^2\right)\text{]}\right\}\)
\(=3^2-\left(120-2\cdot89\right)\)
\(=9--58=9+58=67\)
1. \(a,3^4:3^2-\left[120-(2^6\cdot2+5^2\cdot2)\right]\)
\(=3^2-\left[120-\left\{(2^6+5^2)\cdot2\right\}\right]\)
\(=3^2-\left[120-\left\{(64+25)\cdot2\right\}\right]\)
\(=9-\left[120-89\cdot2\right]\)
\(=9-\left[120-178\right]=9-(-58)=67\)
b, Tương tự như bài a
2.a,\(4^x\cdot5+4^2\cdot2=2^3\cdot7+56\)
\(\Leftrightarrow4^x\cdot5+16\cdot2=8\cdot7+56\)
\(\Leftrightarrow4^x\cdot5+32=56+56\)
\(\Leftrightarrow4^x\cdot5+32=112\)
\(\Leftrightarrow4^x\cdot5=80\)
\(\Leftrightarrow4^x=16\Leftrightarrow4^x=4^2\Leftrightarrow x=2\)
\(b,24:(2x-1)^3-2=1\)
\(\Leftrightarrow24:(2x-1)^3=3\)
\(\Leftrightarrow(2x-1)^3=8\)
\(\Leftrightarrow(2x-1)^3=2^3\)
\(\Leftrightarrow2x-1=2\)
Làm nốt là xong thôi
\(a,42.9-555+9.58=378-555+552\)
\(=345\)
\(b,92:\left(5+2.\left(13-10\right)^2\right)=92:\left(5+2.9\right)\)
\(=92:\left(5+18\right)\)
\(=92:23\)
\(=4\)
\(c,5^9:5^6-4^2.4=125-64\)
\(=61\)
a) 42 . 9 - 555 + 9 . 58
= 378 - 555 + 522
= ( - 177 ) + 522
= 345
b) 92 : [ 5 + 2 . ( 13 - 10 )2 ]
= 92 : [ 5 + 2 . 32 ]
= 92 : [ 5 + 2 . 9 ]
= 92 : [ 5 + 18 ]
= 92 : 23
= 4
c) 59 : 56 - 42 . 4
= 53 - 43
= 125 - 64
= 61
a) 48. ( 19 + 115 ) + 134 . 52
= 48 . 134 + 134 . 52
= 134. ( 48 + 52 )
= 134 . 100
= 13400
b) 52 + 25 - 1
= 25 + 32 - 1
= 57 - 1
= 56
Hk tốt
a) 48 . 19 + 48 . 115 + 134 . 52 b) 56 : 54 + 23 . 22 - 12017
= 48 . ( 19 + 115 ) + 134 . 52 = 52 + 25 - 12017
= 48 . 134 + 134 . 52 = 25 + 32 - 1
= 134 . 100 = 56
= 13 400
a. 15 . 23 + 4 . 32 - 5 . 7
=15 . 8+4 . 9 - 5 . 7
= 120 + 36 - 35
= 120+1
= 121
a) 146,4
b) 27
a) 73.142 + 73.258
=73.(142 + 258)
=73.400
=29200