Tìm X:
37+X=87
77-X=47
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\(a.216\times y+y=3689\)
\(y\times\left(216+1\right)=3689\)
\(y\times217=3689\)
\(y=3689:217\)
\(y=17\)
\(b.y\times47-37\times y=20210\)
\(y\times\left(47-37\right)=20210\)
\(y\times10=20210\)
\(y=20210:10\)
\(y=2021\)
a)
216 * y + y = 3689
y * (216+1)=3689
y*217=3689
y=3689:217
y=17
b)
y * 47 - 37 * y = 20210
*y (47-37)=20210
y * 10 = 20210
y = 20210 :10
y= 2021
a) (x - 20) : 312 = 214
x - 20 = 214 x 312
x - 20 = 66768
x = 66768 + 20
x = 66788
vậy x = 66788
b) (x + 37) : 11 = 47
x + 37 = 47 x 11
x + 37 = 517
x = 517 - 37
x = 480
vậy x = 480
c)(78876 : 9) + x = 10127
8764 + x = 10127
x = 10127 - 8754
x = 1363
vậy x = 1363
11 x 13 x 15 x 17 + 23 x 25 x 27 x 29 + 31 x 33 x 35 x 37 + 45 x 47 x 49 x 51
=7096860
#Hok tốt!#
\(37\times46+37\times51+111\)
\(=37\times46+37\times51+37\times3\)
\(=37\times\left(46+51+3\right)\)
\(=37\times100\)
\(=3700\)
------------
\(172\times47+86\times8-34\times4\)
\(=172\times47+172\times4-34\times4\)
\(=172\times\left(47+4\right)-34\times4\)
\(=172\times51-34\times4\)
\(=172\times3\times17-17\times2\times4\)
\(=17\times\left(172\times3-2\times4\right)\)
\(=17\times\left(516-8\right)\)
\(=17\times508\)
\(=8636\)
------------
\(35\times215-35\times200-175\)
\(=35\times215-35\times200-35\times5\)
\(=35\times\left(215-200-5\right)\)
\(=35\times10\)
\(=350\)
------------
\(48\times56+28\times104\)
\(=48\times2\times28+28\times104\)
\(=28\times\left(48\times2+104\right)\)
\(=28\times200\)
\(=5600\)
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) \(48\times56+28\times104\)
\(=48\times56+56\times52\)
\(=56\times\left(48+52\right)\)
\(=56\times100\)
\(=5600\)
37 + X = 87
X = 87 - 37
X = 40
77 - X = 47
X = 77 - 47
X = 30
37 + x = 87
X = 87 - 37
X = 50
77 - X = 47
X = 77 - 47
X = 30
**** cho minh nha