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a) 5 x 3 x 4 = (5 x 4) x 3
= 20 x 3
= 60
b) 6 x 5 x 7 = (6 x 5) x 7
= 30 x 7
= 210
c) 20 x 9 x 5 = (20 x 5) x 9
= 100 x 9
= 900
d) 2 x 7 x 50 = (2 x 50) x 7
= 100 x 7
= 700
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a) \(x=6\times1000+3\times100+2\times10+8=6000+300+20+8=6328\)
b) \(x=5\times1000+6\times10+7=5000+60+7=5067\)
c) \(x=9\times1000+9\times100+9=9000+900+9=9909\)
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a) 4x7x5
=(4x5)x7
=20x7
=140
b) 15x9x2
=(15x2)x9
=30x9
=270
c) 25x895x4
=(25x4)x895
=100x895
=89500
d) 2x3238x50
=(2x50)x3238
=100x3238
=323800
tk nhé
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Bảng nhân 100 à ?
100 x 1 = 100
100 x 2 = 200
100 x 3 = 300
100 x 4 = 400
100 x 5 = 500
100 x 6 = 600
100 x 7 = 700
100 x 8 = 800
100 x 9 = 900
100 x 10 = 1000
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a)x0x0x=x0000 + x00 + x
=x0000 + x0x
=x0x0x
Vay ta dien dau =.
b)a3 + 3a = a0 +3 + 30 + 3
=aa + 33
=a x 11 + 3 x 11
=(a + 3)x11(nhan 1 so voi 1 tong )
Vay a3 + 3a = (a+3 0x11)
X x 2 - 100 = 1000
x x 2 = 1000 - 100
x x 2 = 900
x = 900 : 2
x = 450
x : (50 x 5)= 9
x : 250 = 9
x = 9 x 250
x = 2250
x : [50 x 5]= 9
x = 2250