4/15 : y x2 = 4/15 [ 36 + 54 ] x 7 +9 x 7 +7
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( 54 x 15 ) :9
=54:9x15
=90
( 56 x 23 x 4 ) :7
=56:7x23x4
=8x23x4
=32x23
=736
(36 + 54) x 7 + 7 x 9 + 7
= 90 x 7 + 7 x 9 + 7
= (90 + 9 + 1 ) x 7
= 100 x 7
= 700
(36 + 54) x 7 + 7 x 9 + 7
= 90 x 7 + 7 x 9 + 7
= (90 + 9 + 1 ) x 7
= 100 x 7
= 700
a)7.(90+9+1)
=7.100
=700
b)3/4.(3/9+2/3)
=3/4.1
=3/4
a) ( 36 + 54 ) x 7 + 7 x 9 + 7
= ( 36 + 54 + 9 + 1 ) x 7
= 100 x 7
= 700
b) \(\frac{3}{4}\times\frac{3}{9}+\frac{3}{4}\times\frac{2}{3}\)
\(=\left(\frac{3}{9}+\frac{2}{3}\right)\times\frac{3}{4}\)
\(=1\times\frac{3}{4}\)
\(=\frac{3}{4}\)
\(\frac{7}{4}\times\frac{15}{7}+\frac{13}{7}\times\frac{9}{4}-\frac{2}{7}\)
\(=\left(\frac{7}{4}+\frac{9}{4}\right)\times\left(\frac{15}{7}+\frac{13}{7}\right)-\frac{2}{7}\)
\(=4\times4-\frac{2}{7}\)
\(=16-\frac{2}{7}\)
\(=\frac{112}{7}-\frac{2}{7}\)
\(=\frac{110}{7}\)
\(\dfrac{9}{4}\times\dfrac{15}{11}+\dfrac{3}{4}:\dfrac{11}{7}-\dfrac{3}{4}\times\dfrac{8}{11}\)
\(=\dfrac{3}{4}\times3\times\dfrac{15}{11}+\dfrac{3}{4}\times\dfrac{7}{11}-\dfrac{3}{4}\times\dfrac{8}{11}\)
\(=\dfrac{3}{4}\times\dfrac{45}{11}+\dfrac{3}{4}\times\dfrac{7}{11}-\dfrac{3}{4}\times\dfrac{8}{11}\)
\(=\dfrac{3}{4}\times\left(\dfrac{45}{11}+\dfrac{7}{11}-\dfrac{8}{11}\right)\)
\(=\dfrac{3}{4}\times4\)
\(=3\)
`9/4xx15/11+3/4:11/7-3/4xx8/11`
`=3/4xx15/11xx3+3/4xx7/11-3/4xx8/11`
`=3/4xx45/11+3/4xx7/11-3/4xx8/11`
`=3/4xx(45/11+7/11-8/11)`
`=3/4xx4`
`=3`
đcmm =))
đcmnm mtct