a) 185 + 434+ 515 + 266 + 155
b) 652 + 327 + 148 + 15 + 73
c) 5 . 125 . 2 . 1 . 8
d) 8.12.125.2
e) 3.25.8.+4.37.6+2.38.12
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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
4:
a: \(\dfrac{\left(158-x\right)}{7}=20\)
=>\(158-x=7\cdot20=140\)
=>x=158-140=18
b: \(2x-138=23\cdot32\)
=>\(2x-138=736\)
=>2x=736+138=874
=>x=437
c: \(231-\left(x-6\right)=\dfrac{1339}{13}\)
=>\(231-\left(x-6\right)=103\)
=>x-6=128
=>x=128+6=134
d: \(10+2x=\dfrac{45}{43}\)
=>\(2x=\dfrac{45}{43}-10=-\dfrac{385}{43}\)
=>\(x=-\dfrac{385}{43}:2=-\dfrac{385}{86}\)
e: \(70-5\left(2x-3\right)=45\)
=>\(5\left(2x-3\right)=70-45=25\)
=>2x-3=5
=>2x=8
=>x=4
g: \(156-\left(x+61\right)=82\)
=>x+61=156-82=74
=>x=74-61=13
a) 185 + 434 + 515 + 266 + 155
= ( 185 + 515 + 155 ) + ( 434 + 266 )
= 855 + 700
= 1555
b) 12 . 53 + 53 . 17 - 53 . 84
= 53 . ( 12 + 17 - 84 )
= 53 . ( - 55 )
= -2915
a, 185 + 434 + 515 + 266 + 155
= ( 185 + 515 + 155 ) + ( 434 + 266 )
= 855 + 700
= 1555
b, 12 . 53 + 53 . 17 - 53 . 84
= 53 . ( 12 + 17 - 84 )
= 53 . ( -55 )
= -2915
c, 19 . 128 + 36 . 82 + 64 . 69 + 64 .41
= 2432 + 2952 + 64 . ( 69 + 41 )
= 5384 + 64 . 110
= 5384 + 7040
= 12424
3.25.8 + 4.37.6 + 2.3812 - 24.25 + 24.37 + 24.38
= 24.(25 + 37 + 38) = 2400
3*25*8+4*37*6+2*38*12=24*25+24*37+24*38=24*(25+37+38)=24*100=2400
3.25.8+4.6.37+2.38.12
<=> 24.25+24.37+24.38
<=> 24.(25+37+38)
<=> 24.100
<=> 2400
a: =274+184=458
b: =29+132+868+237+163
=1000+400+29
=1429
f: =A*135*137(1001-1001)=0
e: =24*25+24*37+24*38
=24*100=2400
c: =31(98+2)=31*100=3100
3.25.8 + 4.37.6 + 2.38.12
= 3.8.25 + 4.6.37 + 2.12.38
=24.25 + 24.37 + 24.38
=24.(25+27+38)
=24.87
=2088
a) 185+434+515+266+155 = (185+515)+(434+266)+155
= 700+700+155 = 1555
b. (652+148)+(327+73)+15=800+400+15=1215
c. (125*8)*(5*2)*1=1000*10*1=10000
d. (125*8)*(12*2)=1000*24=24000
e.3*25*4*2+4*37*6+2*38*12=600+888+912=2400
mik ik mik til lại cko nha! mấy bạn
a=1555
b=1188
c=10000
d=24000
e=2400