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a. x - 1,27 = 13,5 : 4,5
=> x - 1,27 = 3
=> x = 3 + 1,27
=> x = 4,27
b. x + 18,7 = 50,5 : 2,5
=> x + 18,7 = 20,2
=> x = 20,2 - 18,7
=> x = 1,5
c. x * 12,5 = 6 * 2,5
=> x * 12,5 = 15
=> x = 15 : 12,5
=> x = 1,2
34-y:5=12,5
y:5=34-12,5
y:5=21,5
y=21,5*5
y=10,5
6,35xy+3,65xy=50
(6,35+3,65)xy=50
10xy=50
xy=50:10=5
a) 8,76 x 34 + 67 x 8,76 - 8,76
= 8,76 x 34 + 67 x 8,76 - 8,76 x 1
= 8,76 x ( 34 + 67 - 1 )
= 8,76 x 100
= 876
b) 12,5 x 3,27 + 67,3 x 12,5
= 12,5 x ( 3,27 + 67,3 )
= 12,5 x 70,57
= 882,125
c) 56,725 x 53,69 + 56,725 x 55,69 + 56,725
= 56,725 x 53,69 + 56,725 x 55,69 + 56,725 x 1
= 56,725 x ( 53,69 + 55,69 + 1 )
= 56,725 x 110,38
= 6261,13055
a) 8,76.34+67.8,76-8,76
=8,76.34+67.8,76-8,76.1
=8,76(34+67-1)
=8,76.100
=876
b)12,5.32,7+67,3.12,5
=12,5(32,7+67,3)
=12,5.100
=1250
c)56,725.53,69+56,725.55,69+56,725
=56,725.53,69+56,725.55,69+56,725.1
=56,725(53,69+55,69+1)
=56,725.109,39
=6205,14775
a) 25 x 41,6 + 12,5 x 3,7 b) 42,8 x 4,9 + 34 x 4,1
= 1040 + 46,25 = 209,72 + 139,4
= 1086,25 = 349,12
/HT\
\(37\times46+37\times51+111\)
\(=37\times46+37\times51+37\times3\)
\(=37\times\left(46+51+3\right)\)
\(=37\times100\)
\(=3700\)
------------
\(172\times47+86\times8-34\times4\)
\(=172\times47+172\times4-34\times4\)
\(=172\times\left(47+4\right)-34\times4\)
\(=172\times51-34\times4\)
\(=172\times3\times17-17\times2\times4\)
\(=17\times\left(172\times3-2\times4\right)\)
\(=17\times\left(516-8\right)\)
\(=17\times508\)
\(=8636\)
------------
\(35\times215-35\times200-175\)
\(=35\times215-35\times200-35\times5\)
\(=35\times\left(215-200-5\right)\)
\(=35\times10\)
\(=350\)
------------
\(48\times56+28\times104\)
\(=48\times2\times28+28\times104\)
\(=28\times\left(48\times2+104\right)\)
\(=28\times200\)
\(=5600\)
a) \(37\times46+37\times51+111\)
\(=37\times46+37\times51+37\times3\)
\(=37\times\left(46+51+3\right)\)
\(=37\times100\)
\(=3700\)
b) \(35\times215-35\times210-175\)
\(=35\times215-35\times210-35\times5\)
\(=35\times\left(215-210-5\right)\)
\(=35\times0\)
\(=0\)
c) \(172\times47+86\times8-34\times4\)
\(=4\times\left(43\times47+86\times2-34\right)\)
\(=4\times\left(2021+172-34\right)\)
\(=4\times2159\)
\(=8636\)
d) \(48\times56+28\times104\)
\(=48\times56+56\times52\)
\(=56\times\left(48+52\right)\)
\(=56\times100\)
\(=5600\)
a)9,18x1,25x80
=9,18x(1,25x80)
=9,18x100
=918
b)12,5x6,5+2,5x12,5+12,5
12,5x(6,5+2,5)+12,5
=12,5x9+12,5
=112,5+12,5
=125
A
A