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a;=>3x=978
=>x=326
b: =>x=(2467-2):5=493
c: =>x=1479*7+3=10356
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Bài 1
a) 3828 : x = 9 ( dư 3 )
x = ( 3828 - 3 ) : 9
x =3825 : 9
x = 425
b) x : 6 = 1484 ( dư 4 )
x = 1484 x 6 + 4
x = 8904 + 4
x = 8908
Bài 2 : Tính nhanh
5 x 8 - 16 + 6 x 8 + 8
= 5 x 8 + 6 x 8 - 16 + 8
=8 x ( 5+ 6) - 16 +8
=8 x 11 - 24
= 88 - 24
= 64
bài 2 mình làm nhầm
Bài 2 : Tính nhanh
5 x 8 - 16 + 6 x 8 + 8
= 5 x 8 + 6x 8 + 8 -16
= 8 x( 5 +6 ) + 8 - 16
= 8 x 11 + 8 x 1 - 16
= 8 x ( 11 + 1 ) - 16
= 8 x 12 - 16
= 96 - 16
= 80
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1x1+3x3+5x5+7x7+9x9
=1+9+25+49+81
=165
2x2+4x4+6x6+8x8
=4+16+36+64
=120
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X = 6 \(\times\) 8 + 6 \(\times\) 2 - 5 \(\times\) 10
X = 6 \(\times\) ( 8 + 2) - 5 \(\times\) 10
X = 6 \(\times\) 10 - 5 \(\times\) 10
X = 10 \(\times\) (6-5)
X = 10 \(\times\) 1
X = 10
A = (90:9 + 64) \(\times\) (6 \(\times\) 6 - 4 \(\times\)9)
A = (90 : 9 + 64) \(\times\)(36 - 36)
A = (90:9 + 64) \(\times\) 0
A = 0
X = 6 x 8 + 6 x 2 - 5 x 10
X = 48 + 12 - 50
X = 10
A = ( 90 : 9 + 64 ) x ( 6 x 6 - 4 x 9 )
A = ( 10 + 64 ) x ( 36 - 36)
A = 74 x 0
A = 0
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5 x 5 + 4 x 5
= 5 x ( 5 + 4 )
= 5 x 9
= 45
6 x 9 + 5 x 9
= 9 x ( 6 + 5 )
= 9 x 11
= 99
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\(\Rightarrow\)x+1\(\in\)BCNN(2;3;4;5;6)=30
x+1=30
x=30-1
x=29
ủng hộ nha
Xx6:5=9 ( dư 3 )
x=9:6x9
x=1.5x5
x=7.5 nhé !
Xx6:5=9 ( dư 3 )
x=9:6x5
x=1.5x5
x=7.5