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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
\(a.=2,35\times\left(7+3\right)\)
\(=2,35\times10\)
\(=23,5\)
\(b.=6,75\times\left(12-2\right)\)
\(=6,75\times10\)
\(=67,5\)
\(c.=25\times4\times37,65\)
\(=100\times37,65\)
\(=3765\)
\(d.=20:2\times16,47\)
\(=10\times16,47\)
\(=164,7\)
\(a.=\left(16,52+3.48\right)+25,87\)
\(=20+25,87\)
\(=45,87\)
\(b.=37,27+\left(91,54+8,46\right)\)
\(=37,27+100\)
\(=137,27\)
\(c.x=5,85+2,14\)
\(x=7,99\)
\(d.x=2,6+4,75\)
\(x=7,35\)
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
\(\left(42,8\cdot6,9-154,56\right):34,5\)
\(=\left(295,32-154,56\right):34,5\)
\(=\frac{107}{56}:34,5\)
\(=\frac{107}{1932}=0,05...\)
Hc tốt #
\(\left(42,8\times6,9-154,56\right):34,5\)
\(=\left(295,32-154,56\right):34,5\)
\(=140,76:34,5\)
\(=4,08\)
14,35 × 63 + 14,35 × 36 + 14,35
= 14,35 x 63 + 14,35 x 36 + 14,35 x 1
= 14,35 x ( 63 + 36 + 1 )
= 14,56 x 100
= 1456
\(14,35\times63+14,35\times36+14,35\)
\(=14,35\times\left(63+36+1\right)\)
\(=14,35\times100\)
\(=1435\)
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
\(1,6.96+3,2.2\)\(=1,6.96+1,6.2.2\)
\(=1,6.96+1,6.4\)
\(=1,6.\left(96+4\right)\)
\(=1,6.100=160\)
a) \(18,71-9,24+16,29-6,76\)
\(=\left(18,71+16,29\right)-9,24-6,76\)
\(=\left(18,71+16,29\right)-\left(9,24+6,76\right)\)
\(=35-16=19\)
b) \(25,75+24,36-35,75\)
\(=25,75+24,36-\left(25,75+10\right)\)
\(=25,75+24,36-25,75-10\)
\(=\left(25,75-25,75\right)+\left(24,36-10\right)\)
\(=0+14,36=14,36\)
a) 18,71 - 9,24 +16,29 -6,76
= (18,71 + 16,29) - (9,24 +6,76)
= 35 - 16
= 19
b) 25,75 + 24,36 -35,75
= 25,75 + 24,36 - ( 25,75 + 10)
= 25 ,75 + 24,36 - 25,75 - 10
= (25,75 - 25,75 ) + ( 24,36 -10 )
= 0 +14,36
= 14,36
a)
=9,85.(25,82-12,32-3,5)
=9,85.10
=98,5.
b)
=5/4.1/4.4.4/5.1/4.6/5
=3/40.
67.7 x 90 + 67.7 : 0.1
= 67.7 x 90 + 67.7 x 10
= 67.7 x ( 90 + 10 )
= 67.7 x 100
= 6770.
67.7 x 90 + 67.7 : 0.1
= 67.7 x 90 + 67.7 x 10
= 67.7 x ( 90 + 10 )
= 67.7 x 100
= 6770