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6,75 x 5,5 + 6,75 x 3,5 + 6,75
= 6,75 x ( 5,5 + 3,5 + 1)
= 6,75 x 10
= 67,5
6,75 x 5,5 + 6,75 x 3,5+ 6,75
=6,75 x 5,5 + 6,75 x 3,5 + 6,75 x 1
=6,75 x ( 5,5 + 3,5 + 1)
=6,75 x 10
=67,5
k cho mình nha
a) 12,5 x 9,4 x 0,8 = ( 12,5 x 0.8 ) x 9,4
= 10 x 9,4
= 94
b) 7,29 x 5,3 + 7,29 x 4,7 = 7,29 x ( 5,3 + 4,7 )
= 7,29 x 10
= 72,9
c) 75,32 - 46,75 - 13,25 = 75,32 - ( 46,75 + 13,25 )
= 75,32 - 60
a, = (12,5 x 0,8 ) x 9,4 = 10 x 9,4 = 94
b, = 7,19 x (5,3+4,7) = 7,19 x 10 = 71,9
c, = 75,32 - (46,75 + 13,25) = 75,32 - 60 = 15,32
d, = 6,75 x (101-1) = 6,75 x 100 = 675
k mk nha
a, ( 12,5 x 0,8 ) x 9,4
= 10 x 9 ,4
= 94
Phần b sai đề ak
c, 75,32 - 46 ,75 - 13,25
= 75,32 - ( 46 , 75 + 13 , 25 )
= 75 , 32 - 60
= 15 , 32
d , 6,75 x 101 - 6,75 x1
= 6,75 x ( 101 - 1 )
= 6,75 X 100
= 675
a) 36 + 12 + 14 + 38 = (36 + 14) + (12 + 38)
= 50 + 50
= 100
b) 2 x 3 x 5 000 = (2 x 5 000) x 3
= 10 000 x 3
= 30 000
c) 9 x 13 + 9 x 7 = 9 x (13 + 7)
= 9 x 20
= 180
a) 1 267 + 99 + 501 = 1 267 + (99 + 501)
= 1 267 + 600 = 1 867
25 x 14 x 4 = (25 x 4) x 14
= 100 x 14 = 1 400
b) 3 905 x (50 – 1) = 3 905 x 50 – 3 905 x 1
= 195 250 – 3 905 = 191 345
270 : ( 27 x 2 ) = 270 : 27 : 2
= 10 : 2 = 5
c) 115 x 58 + 115 x 42 = 115 x (58 + 42)
= 115 x 100 = 11 500
136 x 67 – 136 x 66 = 136 x (67 – 66)
= 136 x 1 = 136
a,19,75 x 0,4 x 2,5 b,9,67 x80 x 1,25
=19,75 x 1 =9,67 x 100
=19,75 =967
c,15,85 x 6,85 - 6,85 x 3,5 -2,35 x 6,85 d,1,25 x 0,35 x 0,8 +0,5614 +1,4386
=6,85 x (15,85 - 3,5 - 2,35) =0,35 x (1,25 x 0,8) + (0,5614 + 1,4386)
=6,85 x 10 =0,35 x 1 + 2
=68,5 =0,35 +2
=2,35
a,19,75 x 0,4 x 2,5 b,9,67 x80 x 1,25
=19,75 x 1 =9,67 x 100
=19,75 =967
c,15,85 x 6,85 - 6,85 x 3,5 -2,35 x 6,85 d,1,25 x 0,35 x 0,8 +0,5614 +1,4386
=6,85 x (15,85 - 3,5 - 2,35) =0,35 x (1,25 x 0,8) + (0,5614 + 1,4386)
=6,85 x 10 =0,35 x 1 + 2
=68,5 =0,35 +2
=2,35
a) \(\dfrac{7}{9}\times\dfrac{13}{25}\times\dfrac{9}{7}=\left(\dfrac{7}{9}\times\dfrac{9}{7}\right)\times\dfrac{13}{25}=1\times\dfrac{13}{25}=\dfrac{13}{25}\)
b) \(\dfrac{5}{9}\times\dfrac{21}{25}+\dfrac{21}{25}\times\dfrac{4}{9}\)
\(=\dfrac{21}{25}\times\left(\dfrac{5}{9}+\dfrac{4}{9}\right)\)
\(=\dfrac{21}{25}\times1=\dfrac{21}{25}\)
c) \(\dfrac{19}{5}\times\dfrac{11}{16}-\dfrac{9}{5}\times\dfrac{11}{16}\)
\(=\dfrac{11}{16}\times\left(\dfrac{19}{5}-\dfrac{9}{5}\right)\)
\(=\dfrac{11}{16}\times2=\dfrac{22}{16}=\dfrac{11}{8}\)
\(1\frac{1}{4}-6,75+6,25+12\times27-1,25+135\times\frac{1}{3}\)
\(=\frac{5}{4}-6,75+6,25+12\times27-1,25+135\times\frac{1}{3}\)
\(=1,25-6,75+6,25-1,25+324+45\)
\(=-5,5+5+324+45\)
\(=-0,5+324+45\)
\(=\left(-0,5+45\right)+324\)
\(=44,5+324\)
\(=368,5\)
a)2.25x7+3x2,25
=2,25(7+3)
=2,25.10
=22,5
\(a.=2,35\times\left(7+3\right)\)
\(=2,35\times10\)
\(=23,5\)
\(b.=6,75\times\left(12-2\right)\)
\(=6,75\times10\)
\(=67,5\)
\(c.=25\times4\times37,65\)
\(=100\times37,65\)
\(=3765\)
\(d.=20:2\times16,47\)
\(=10\times16,47\)
\(=164,7\)