Tình bằng cách thuận tiện nhất: 642-29+329-42+100
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(3214 x 42 - 27 x 3214 - 642 : 3 x15) :300
=(3214 x (42 - 27) - 642 : 3 x 15) : 300
=(3214 x 15 - 214 x 15) : 300
=(3214 - 214) x 15 : 300
=3000 x 15 :300
= 45000: 300=150
a,=3/13.17/29.29/34
=3/13.1/2
=3/26
b,=(4/21+25/42).19/33
=11/14.19/33
=19/42
`a, = 3/13 xx (17/29 xx 29/34)`
`= 3/13 xx 1/2`
`= 3/26`.
`b, = 19/33(4/21 + 25/42)`
`= 19/33 xx ( 33/42 )`
`= 19/42`
`@` `\text {Ans}`
`\downarrow`
`471 + 43 + 29 + 57`
`= (471 + 29) + (43+57)`
`= 500 + 100`
`= 600`
471+43+29+57
= (471+29)+(43+57)
=500+100
=600
Chúc bn hok tốt!!!
\(\dfrac{45}{100}+\dfrac{9}{20}\times29+45\%\times30\) + 0,9 \(\times\) 20
= \(\dfrac{9}{20}\) + \(\dfrac{9}{20}\times29\) + \(\dfrac{9}{20}\) \(\times\) 30 + 18
= \(\dfrac{9}{20}\) \(\times\) ( 1 + 29 + 30) + 18
= \(\dfrac{9}{20}\) \(\times\) 60 + 18
= 27 + 18
= 45
b, 53 + 45 + 135 + 147 + 50
= ( 53 + 147 ) + ( 45 + 135 ) + 50
= 200 + 180 + 50
= 200 + 330
= 530
b, 53 + 45 + 135 + 147 + 50
=(53+147)+(45+135+50)
=200+230
=430
75/100 + 3/4 x 29 + 75% x 30 + 0,75 x 40
= 0,75 + 0,75 x 29 + 0,75 x30 + 0,75 x 40
= 0,75 x ( 1 + 29 + 30 + 40 )
= 0,75 x 100
=75
\(\frac{75}{100}+\frac{3}{4}\times29+75\%\times30+0,75\times40\)
\(=\frac{75}{100}\times1+\frac{3\times25}{4\times25}\times29+\frac{75}{100}\times30+\frac{0,75}{1}\times40\)
\(=\frac{75}{100}\times1+\frac{75}{100}\times29+\frac{75}{100}\times30+\frac{0,75\times100}{1\times100}\times40\)
\(=\frac{75}{100}\times1+\frac{75}{100}\times29+\frac{75}{100}\times30+\frac{75}{100}\times40\)
\(=\frac{75}{100}\left(1+29+30+40\right)\)
\(=\frac{75}{100}\times100\)
\(=\frac{75}{100}\times\frac{100}{1}\)
\(=\frac{75}{1}\)
\(=75\)
\(=\frac{75\times100}{100\times1}\)
642 - 29 + 329 - 42 + 100
= ( 642 - 42 ) + ( 329 - 29 ) + 100
= 600 + 300 + 100
= 1000
Nhớ tk mình nha!
642 – 29 + 329 – 42 +100
= (642 – 42) + (329 – 29) + 100
= 600 + 300 + 100
= 1000