Thực hiện phép tính bằng cách hop lý nhát
a, 277+113+323+87. b,185+434+515+266+155
d, 4×36×25×50
C, 8×12×125×2
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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) 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
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
\(a)9.4.25.8.125\)
\(=9.\left(4.25\right).\left(8.125\right)\)
\(=9.100.1000\)
\(=900.1000\)
\(=900000\)
\(a,9.4.25.8.125=9.\left(4.25\right).\left(8.125\right)=9.100.1000=900000\)
\(b,25.5.27.2\)(câu này hình như thiếu đề, ko tính nhanh đc)
\(c,37.7+80.3+43.7\)\(=7.\left(37+43\right)+80.3\)\(=7.80+3.80=80\left(7+3\right)=80.10=800\)
\(d,113.38+113.62+87.62+87.38\)\(=113\left(38+62\right)+87\left(62+38\right)\)
\(=113.100+87.100=100.\left(113+87\right)=100.200=20000\)
Viết gọn lũy thừa:
\(a,x.x.y.y.x.y.x=\left(x.x.x.x\right).\left(y.y.y\right)=x^4.y^4\)
\(b,7^5:343=7^5:7^3=7^{5-3}=7^2\)
\(c,A^{12}:A^{18}=A^{12-18}=A^{-6}\)
\(d,x^7.x^4.x=x^{7+4+1}=x^{12}\)
a) 5 . 125 . 2 . 41 . 8
= (5 . 8) . (125 . 2) . 41
= 40 . 250 . 41
= 10 000 . 41
= 410 000
b) 25 . 7 . 10 . 4
= (25 . 4 ) . (10 . 7)
= 100 . 70
= 7000
Chúc bạn học tốt!! ^^
a,5.125.2.41.8=(125.8).(2.5).41=1000.10.41=410000
b,25.7.10.4=(25.4).70=100.70=7000
c,8.12.125.2=(8.125).12.2=100.24=2400
d,4.36.25.50=(4.25).(2.50).18=100.100.18=180000
a, 277 + 113 + 323 + 87
= ( 277 + 323 ) + ( 113 + 87 )
= 600 + 200
= 800
b, 185 + 434 + 515 + 266 + 155
= ( 185 + 515 ) + ( 434 + 266 ) + 155
= 700 + 700 + 155
= 1400 + 155
= 1555
c, 8 . 12 . 125 . 2
= ( 125 . 8 ) . ( 12 . 2 )
= 1000 . 24
= 24000
d, 4 . 36 . 25 . 50
= ( 4 . 25 ) . ( 36 . 50 )
= 100 . 1800
= 180000
a, 277 + 113 + 323 + 87
= ( 277 + 323 ) + ( 113 + 87 )
= 600 + 200
= 800
b, 185 + 434 + 515 + 266 + 155
= ( 185 + 515 ) + ( 434 + 266 ) + 155
= 700 + 700 + 155
= 1400 + 155
= 1555
c, 8 . 12 . 125 . 2
= ( 125 . 8 ) . ( 12 . 2 )
= 1000 . 24
= 24000
d, 4 . 36 . 25 . 50
= ( 4 . 25 ) . ( 36 . 50 )
= 100 . 1800
= 180000