(321+27)+79
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a) 67+135+33=(67+33)+135=100+135=235
b) 277+13+323+87=(277+323)+(113+87)=600+200=800
c) 29+132 + 237 + 868 + 763=29+(132+868)+(237+763)=29+1000+1000=2029
d) 652 + 327 + 148 + 15 + 73=(652+148)+(327+73)+15=800+400+15=1215
e) 463 + 318 + 137 + 22=(463+137)+(318+22)=600+340=940
g) 189 + 424 +511 + 276 + 55=(189+511)+(424+276)+55=700+700+55=1455
h) (321 +27) + 79=(321+79)+27=400+27=427
i) 185+434+515+266+155=(185+515)+(434+266)+155=700+700+155=1555
k) 168 + 79 + 132=(168+132)+79=300+79=379
l) 29 + 132 + 237 + 868 + 763=29+(132+868)+(237+763)=29+1000+1000=2029
a: \(4\cdot3^3-75:5^2\)
\(=4\cdot27-\dfrac{75}{25}\)
=108-3
=105
b: \(7\cdot2^4-16\cdot3\)
\(=16\cdot7-16\cdot3\)
=16(7-3)
=16*4=64
c: \(2^3\cdot17-2^3\cdot14\)
\(=8\cdot17-8\cdot14\)
=8(17-14)
=8*3
=24
d: \(45+\dfrac{54}{3^2}\)
\(=45+\dfrac{54}{9}\)
=45+6
=51
e: \(17\cdot85+15\cdot17-120\)
\(=17\left(85+15\right)-120\)
=1700-120
=1580
f: \(\dfrac{3^{24}}{3^{21}}+2^2\cdot2^3\)
\(=3^3+2^5\)
=27+32
=59
g: \(92+4^3:8\)
=92+64/8
=92+8
=100
h: \(5\cdot2^3+7^{11}:7^9-1^{2023}\)
\(=5\cdot8+49-1\)
=40+48
=88
a: =>(2x-1)^5=2^5
=>2x-1=2
=>2x=3
=>x=3/2
b: =>3^x=243*27=3^5*3^3=3^8
=>x=8
a) -(-1998)-(-271+2998)
=1998+271-2998
=(1998-2998)+271
=-1000+271
=-729
b) -31.25+31.119-31.(-6)
=31.(-25+119+6)
=31.100
=3100
c)-79.(73-27)-73.(-79+27)
=-79.73+79.27+79.73-27.73
=(-79.73+79.73)+(79.27-73.27)
=27(79-73)
=27.6
=162
a. 111 + (-11 + 27)
= 111 - 11 + 27
= 100 + 27
= 127
b. (27 + 514) - (486 - 73)
= 27 + 514 - 486 + 73
= (27 + 73) + (514 - 486)
= 100 + 28
= 128
c. (36 + 79) + (145 - 79 - 36)
= 36 + 79 + 145 - 79 - 36
= (36 - 36) + (79 - 79) + 145
= 0 + 0 + 145
= 145
a/ = 111+(-11)+27
tự tính
b/ 27+514 - 486+73
tự tính
c/ 36 + 79 + 145 - 79 - 36
tick mk nha bn
a: \(-7264+\left(1543+7264\right)\)
\(=-7264+1543+7264\)
\(=\left(-7264+7264\right)+1543\)
=0+1543
=1543
b: \(\left(144-97\right)-144\)
\(=144-97-144\)
\(=\left(144-144\right)-97\)
=0-97
=-97
c: \(\left(-145\right)-\left(18-145\right)\)
\(=-145-18+145\)
\(=\left(-145+145\right)-18\)
=0-18
=-18
d: \(111+\left(-11+27\right)\)
\(=\left(111-11\right)+27\)
=100+27
=127
e: \(\left(27+514\right)-\left(486-73\right)\)
\(=27+514-486+73\)
\(=\left(27+73\right)+\left(514-486\right)\)
\(=100+28=128\)
f: \(\left(36+79\right)+\left(145-79-36\right)\)
\(=36+79+145-79-36\)
\(=\left(36-36\right)+\left(79-79\right)+145\)
=0+0+145
=145
bằng 427 nhé
"HT"
(321+27)+79
=(321+79)+27
=400+27
=427