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1/2\(\times\)4+50%\(\times\)5+0.5
=2+2.5+0.5
=4.5+0.5
=5
\(1:\frac{5}{6}-1\)
\(=1.\frac{6}{5}-1\)
\(=1.\left(\frac{6}{5}-1\right)\)
\(=1.\frac{1}{5}=\frac{1}{5}\)
\(\frac{20}{11}\times\frac{33}{23}\times\frac{69}{180}=\frac{20}{11}\times\left(\frac{33}{23}\times\frac{23}{60}\right)\)
\(=\frac{20}{11}\times\frac{759}{1380}=\frac{20}{11}\times\frac{11}{20}=\frac{220}{220}=1\)
$\frac{20}{11}\times \frac{33}{23}\times \frac{69}{180}=\frac{20}{11}\times \left(\frac{33}{23}\times \frac{23}{60}\right)$
2017*4+2017*62+2017*35-2017
=2017*(4+62+35-1)
=2017*100
=201700
2006*42+2006*39+2006*21-2006*2
=2006*(42+39+21-2)
=2006*100
=200600
k mik đi
a, 96 x 123,47 + 123,47 :0,25
=96 x 123,47 + 123, x 4
=123,47 x ( 96 + 4 )
=123,47 x 100
= 12347
b, 1008 x 2,015 + 2,015 : 0,125
=1008 x 2,015 + 2,015 x 8
=2,015 x ( 1008 + 8 )
=2,015 x 1016
=2047,24
=96 x 123,47 + 123, x 4
=123,47 x ( 96 + 4 )
=123,47 x 100
= 12347
b, 1008 x 2,015 + 2,015 : 0,125
=1008 x 2,015 + 2,015 x 8
=2,015 x ( 1008 + 8 )
=2,015 x 1016
=2047,24
a,245 x 5 x 4=245x(5x4)=245x20=4900
b,2x125x4x5=(2x5)x(125x4)=10x500=5000
c,357x36+357x64=357x(36+64)=357x100=35700
d,542x68-28x542=542x(68-28)=542x40=21680
Hok tốt
a) 245 x 5 x 4
= ( 245 x 4 ) x 5
= 980 x 5
= 4900
b) 2 x 125 x 4 x 5
= ( 125 x 4 ) x ( 2 x 5 )
= 500 x 10
= 5000
c) 357 x 36 + 357 x 64
= 357 x ( 36 + 64 )
= 357 x 100
= 35700
d) 542 x 68 - 28 x 542
= 542 x ( 68 - 28 )
= 542 x 40
= 21680
giúp mik đi mà.
a, (50x19):5= (50:5)x19=10x19=190
b, (125x48):6= (48:6)x125=8x125=1000