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\(a.=2,35\times\left(7+3\right)\)
\(=2,35\times10\)
\(=23,5\)
\(b.=6,75\times\left(12-2\right)\)
\(=6,75\times10\)
\(=67,5\)
\(c.=25\times4\times37,65\)
\(=100\times37,65\)
\(=3765\)
\(d.=20:2\times16,47\)
\(=10\times16,47\)
\(=164,7\)
\(a.X\times0,25=24,42-5,42\)
\(X\times0,25=19\)
\(X=19:0,25\)
\(X=76\)
\(b.X-5,3=5,65\times3,2\)
\(X-5,3=18,08\)
\(X=18,08+5,3\)
\(X=23,38\)
Tìm x :
a) x . 0,25 + 5,42 = 24,42
x . 0,25 = 24,42 - 5,42
x . 0,25 = 19
x = 19 : 0,25
x = 76
b) ( x - 5,3 ) : 4,2 = 5,65
( x - 5,3 ) = 5,65 . 4,2
x - 5,3 = 23,73
x = 23,73 + 5,3
x = 29,03
a. 18,71 + 16,29 - ( 9,24 + 6,76 ) = 18,71 + 16,29 - 16 = 18,71 + 0,29 = 19
a,18,71-9,24+16,29-6,7
=(18,71-9,24)+(16,29-6,7)
=9,47+9,59
=19,06
b,25,75+24,36-35,75
=(35,75+25,75)+24,36
=61,5+24,36
=85,86
c,2,5 x 12,5 x 0,8 x 4
=(2,5 x 4) x (12,5 x 0,8)
=10 x 10
=100
d,0,125x0,6x8
=(0,125x8)x0,6
=1x0,6
=0,6
4,3 * 6,5 + 2,15 * 37 + 2,15 * 27 - 2,15
= 2,15 * 13 + 2,15 * 37 + 2,15 * 27 - 2,15
= 2,15 * ( 13 + 37 + 27 - 1 )
= 2,15 * 76
= sai đề
\(\left(42,8\cdot6,9-154,56\right):34,5\)
\(=\left(295,32-154,56\right):34,5\)
\(=\frac{107}{56}:34,5\)
\(=\frac{107}{1932}=0,05...\)
Hc tốt #
\(\left(42,8\times6,9-154,56\right):34,5\)
\(=\left(295,32-154,56\right):34,5\)
\(=140,76:34,5\)
\(=4,08\)
\(a.=\left(16,52+3.48\right)+25,87\)
\(=20+25,87\)
\(=45,87\)
\(b.=37,27+\left(91,54+8,46\right)\)
\(=37,27+100\)
\(=137,27\)
\(c.x=5,85+2,14\)
\(x=7,99\)
\(d.x=2,6+4,75\)
\(x=7,35\)
a) 16,52 + 25,87 + 3,48
=25,87+(16,52+3,48)
=25,87+20
=45,87
37,27 + 91,54 + 8,46
=37,27+(91,54+8,46)
=27,27+10
=127,27
b) x - 2,14=5,85
x=5,85+2,14
x=7,99
x - 4,75=2,6
x=2,6+4,75
x=7,35