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a) \(\left[\left(25-2^2.3\right)+\left(3^2.4+16\right)\right]:5\)
\(=\left[\left(25-4.3\right)\right]+\left(9.4+16\right):5\)
\(=\left[\left(25-12\right)+\left(36+16\right)\right]:5\)
\(=\left[13+52\right]:5\)
\(=65:5\)
\(=13\)
b)\(125\left(28+72\right)-25\left(3^2.4+64\right)\)
\(=125.100-25\left(9.4+64\right)\)
\(=12500-25.\left(36+64\right)\)
\(=12500-25.100\)
\(=12500-2500\)
\(=10000\)
2/25=.2../25 .27../36=3/4
3/.12..=9/36
15/27=5/..9..
..20..28=5/7
36/72=..1../2
\(\dfrac{2}{25}=\dfrac{2}{25}\)
\(\dfrac{27}{36}=\dfrac{3}{4}\)
\(\dfrac{3}{12}=\dfrac{9}{36}\)
\(\dfrac{15}{27}=\dfrac{5}{9}\)
\(\dfrac{20}{28}=\dfrac{5}{7}\)
\(\dfrac{36}{72}=\dfrac{1}{2}\)
a 86+14+357=100+357=457
b 72+128+69=200+69=269
c (25.4).(5.2).4.27
=100.10.4.27
=1000.4.27
=4000.27=64000
d 28. (64+36)=28.100=2800
nha
a) 86 + 357 + 14 b ) 72 + 69 +128
= ( 86 + 14 ) + 357 = ( 72 + 128 ) + 69
= 100 + 357 = 200 + 69 = 269
= 457
c) 25 . 5 . 4 . 27 .2
= ( 25.4).(5.2).27
= 100 x 10 x 27
= 1000 x 27
= 27 000
d) 28.64+28.36
= 28 . ( 64 + 36 )
= 28.100
= 2800
a)=9*3-26
=27-26
=1
b)=125*100-25*100
=12500-2500
=10000
1) 2155-(174+2155)+(-68+174-7)-1911-(1234-1911)
=2155-174-2155+(-68)+174-7-1911-1234+1911
=(2155-2155)+(174-174)+(1911-1911)-(68+7+1234)
= 0 + 0 + 0 - 1309
= -1309
1: Ta có: \(2155-\left(174+2155\right)+\left(-68+174\right)\)
\(=2155-174-2155-68+174\)
=-68
2) Ta có: \(-25\cdot72+25\cdot21-49\cdot25\)
\(=-25\cdot\left(72-21+49\right)\)
\(=-25\cdot100=-2500\)
a. \(\frac{4}{25}\times72+\frac{4}{25}\times28=\frac{4}{25}\times\left(72+28\right)=\frac{4}{25}\times100=4\times4=16\)
b.\(0.5\times72+\frac{3}{6}\times28=0.5\times72+0.5\times28=0.5\times\left(72+28\right)=0.5\times100=50\)
a) 4/25 × 72 + 4/25 × 28
= 4/25 × (72+28)
= 4/25 × 100
= 16/100 × 100
= 16
b) 0.5 × 72 + 3/6 × 28
= 5/10 × 72 + 3/6 × 28
= 1/2 × 72 + 1/2 × 28
= 1/2 × (72 + 28)
= 1/2 × 100
= 5/10 × 100
= 50