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71 x 25 + 71 x 19 + 44 x 29
= 71 x ( 25 + 19 ) + 44 x 29
= 71 x 44 + 44 x 29
= 44 x ( 71 + 29 )
= 44 x 100
= 4400
71x25+71x19+44x29
=71x(25+19)+44x29
=71x44+44x29
=44x(71+29)=44x100=4400
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1000 + x = 20 + 20
1000 + x = 40
x = 1000 - 40
x = 960
tính nhanh
50 x 2 + 50 x 2 = 200
\(1000+x=20+20\)
\(1000+x=40\)
\(x=40-1000\)
\(x=-960\)
\(50x2+50x2\)
\(=50x\left(2+2\right)\)
\(=50x4\)
\(=200\)
\(K\)\(nha\)\(ban!!!\)
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Hướng dẫn giải:
a) 71 x 5 x 4 = 71 x (5 x 4) = 71 x 20 = 1420
b) 123 x 50 x 2 = 123 x (50 x 2) = 123 x 100 = 12300
c) 4 x 138 x 25 = (4 x 25) x 138 = 100 x 138 = 13800
d) 25 x 96 x 4 = (25 x 4) x 96 = 100 x 96 = 9600
e) 5 x 81 x 2 = (5 x 2) x 81 = 10 x 81 = 810
g) 50 x 104 x 2 = (50 x 2) x 104 = 100 x 104 = 10400
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50 x 2 + 8 x 50
= (2 + 8) x 50
= 10 x 50
= 500
10 + 10 + 10 + 50 + 50 + 10 + 10
= (10 x 5) + (50 + 50)
= 50 + 100
= 150
50 x 2 + 8 x 50
= 50 x ( 2 + 8 )
= 50 x 10
= 500
10 + 10 + 10 + 50 + 50 + 10 + 10
= 10 x 5 + 50 x 5
= 50 + 250
= 300
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50 + 50 + 50 + 50 x 10 x 10 + 10
= (50 + 50) + 50 x 10 x 10 + 10
= 100 + 500 x 10 + 10
= 100 + 5000 + 10
= 5110
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\(2x3x4x8x50x25x125=\left(2x50\right)x\left(4x25\right)x\left(8x125\right)x3\)\(=100x100x1000x3=30000000\)
50 x 71 x 2
= ( 50 x 2 ) x 71
= 100 x 71
= 7100
Tính thuận tiện hả e?
50 x 71 x 2
= ( 50 x 2 ) x 71
= 100 x 71
= 7100