Tìm x
982 - X = 215 28 : x = 4
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782 - X = 215 36 : x = 4
X= 782 – 125 x =36 : 4
X= 657 x = 9
\(37\times46+37\times51+111\)
\(=37\times46+37\times51+37\times3\)
\(=37\times\left(46+51+3\right)\)
\(=37\times100\)
\(=3700\)
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\(172\times47+86\times8-34\times4\)
\(=172\times47+172\times4-34\times4\)
\(=172\times\left(47+4\right)-34\times4\)
\(=172\times51-34\times4\)
\(=172\times3\times17-17\times2\times4\)
\(=17\times\left(172\times3-2\times4\right)\)
\(=17\times\left(516-8\right)\)
\(=17\times508\)
\(=8636\)
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\(35\times215-35\times200-175\)
\(=35\times215-35\times200-35\times5\)
\(=35\times\left(215-200-5\right)\)
\(=35\times10\)
\(=350\)
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\(48\times56+28\times104\)
\(=48\times2\times28+28\times104\)
\(=28\times\left(48\times2+104\right)\)
\(=28\times200\)
\(=5600\)
215-(4.x+15)=128
(4.x+15)=215-128
(4.x+15)=87
4.x =87-15
4.x =72
x =72:4=18
215-(4.x+15)=128
(4.x+15)=215-128
4.x+15= 87
4.x=87-15
4.x=72
x=72:4 =18
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) \(48\times56+28\times104\)
\(=48\times56+56\times52\)
\(=56\times\left(48+52\right)\)
\(=56\times100\)
\(=5600\)
\(=-\left(215+x\right)+215=-9\\ -\left(215+x\right)=-224\\ x=-9\)
a)42.3-x=78
126-x=78
x=48
b)34.4+x=215
136+x=215
x=79
c)x.6=21
x=3,5
d)x:4=48
x=192
982 - X = 215 28 : x = 4
X= 982 – 125 x = 28 : 4
X= 857 x = 7