tìm x biết X x186 -X x86=3400
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Tìm x biết:
a,x+1975=90000+10000:2
b,x-1726=8000-1254x5
c,56347-x=23356-12435+14763
d,x:4=3258+4657-3400
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ĐẦU TIÊN BẠN TÍNH PHẦN CUỐI CÁI ĐÃ
TỔNG CỦA CÂU A LÀ 90 000 + 10 000:2=50 000
B LÀ 8000-1254x5=33730
C LÀ 23356-12435 +14763=35684
D LÀ 3258+4657-3400=7915
A /X+1957=50 000
=50 000-1957
X=48047
B/x-1726=33720
x=33720+1726
x=35446
C/56347-x=35684
X=56347-35684
x=20663
D/x:4=7915
x=7945x4
x=34780
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(8,9 x 14,7 + 2,5 x 14,7) x ( 34 x 11 - 3400 x 0,1 - 34)
= [14,7 x ( 8,9 + 2,5 )] x ( 374 - 340 - 34 )
= [ 14,7 x 11,4 ] x ( 34 - 34 )
= 167,58 x 0
= 0
(8,9×14,7+2,5×14,7)×(34×11−3400×0,1−34)
(8,9×14,7+2,5×14,7)×(34×11-3400×0,1-34)
=(8,9×14,7+2,5×14,7)×(34×11−34×10−34×1)=(8,9×14,7+2,5×14,7)×(34×11-34×10-34×1)
=(8,9×14,7+2,5×14,7)× (34×(11−10−1)=(8,9×14,7+2,5×14,7)× (34×(11-10-1)
=(8,9×14,7+2,5×14,7)×(34×0)=(8,9×14,7+2,5×14,7)×(34×0)
=(8,9×14,7+2,5×14,7)×0=(8,9×14,7+2,5×14,7)×0
=0
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a) 1400 : 20 - (17 + x) = 20
70 - (17 + x) = 20
17 + x = 70 - 20
17 + x = 50
x = 50 - 17
x = 33
b) 8 \(\times\) (x + 15) = 640
x + 15 = 640 : 8
x + 15 = 80
x = 80 - 15
x = 65
c) x \(\times\) 62 + x \(\times\) 38 = 4200
x \(\times\) (62 + 38) = 4200
x \(\times\) 100 = 4200
x = 4200 : 100
x = 42
d) x \(\times\) 186 - x \(\times\) 86 = 3400
x \(\times\) (186 - 86) = 3400
x \(\times\) 100 = 3400
x = 3400 : 100
x = 34
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(8,9 x 14,7 + 2,5 x 14,7) x (34 x 11 - 3400 x 0,1 - 34)
= (8,9 x 14,7 + 2,5 x 14,7) x (34 x 11 - 3400 : 10 - 34)
= [14,7 x (8,9 + 2,5)] x (34 x 11 - 34 x 10 - 34 x 1)
= (14,7 x 11,4) x [34 x (11 - 10 - 1)]
= (14,7 x 11,4) x (34 x 0)
= 0
( 14,7 x(8,9 + 2,5) ) x (34 x (11-100x0,1-1 )
=(14,7x11,4)x(34.(11-10-1))
=(14,7x11,4)x(34.0)
=(14,7x11,4)x0
=0
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C1 :\(0,9\times95+1,8\times2+0,9\)
\(=0,9\times95+0,9\times2\times2+0,9\)
\(=0,9\times95+0,9\times4+0,9\)
\(=0,9\times\left(95+4+1\right)\)
\(=0,9\times100\)
\(=90\)
Cách 2 : \(0,9\times95+1,8\times2+0,9\)
\(=85,5+3,6+0,9\)
\(=90\)
câu thứ hai bn tự làm nha
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a, X x 186-Z x 86=3400
X x (186-86) =3400
X x 100=3400
X= 3400: 100
X= 34
b, X x 75+57 x X =32604
X x (75+57)=32604
X x 132=32604
X= 32604 : 132
X = 247
c, 216: X +34: X =10
(216+34) : X=10
250 : X =10
X= 250:10
X= 25
d, 2125:X -125 :X=100
(2125-125) :X= 100
2000: X=100
X= 2000:100
X= 20
a) \(x\times186-x\times86=3400\)
\(x\times\left(186-86\right)=3400\)
\(x\times100=3400\)
\(x=3400:100\)
\(x=34\)
b) \(x\times75+57\times x=32604\)
\(x\times\left(75+57\right)=32604\)
\(x\times132=32604\)
\(x=32604:132\)
\(x=247\)
c) 216 : x + 34 : x = 10
(216 + 34) : x = 10
250 : x = 10
x = 250 : 10
x = 25
d) 2125 : x - 125 : x = 100
(2125 - 125) : x = 100
2000 : x = 100
x = 2000 : 100
x = 20
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a/ 34
b/ 247
c/ 25
d/ 20
T.I.C.K cho mình nha
Chúc bạn hok tốt
`x xx 186 - x xx 86 = 3400`
`=> x xx (186 - 86) = 3400`
`=> x xx 100 = 3400`
`=> x = 3400 : 100`
`=> x = 34`
Vậy `x=34`
x×186−x×86=3400
x×(186−86)=3400
186−86=100
x×100=3400
x=3400 : 100 = 34