tísnh nhanh:\
a, 2.31.12+4.6.42+8.27.3
b, 26.28+36.82+64.69+64.41
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a)=24.31+24.42+24.27=24.(31+42+27)=24.100=2400
b)=36.(28+82)+64.(69+41)=36.110+64.110=110.(36+64)=110.100=11000
a ) = 24 . 31 + 24.42 + 24.27
= 24 . ( 31+42+27)
=24.100
= 2400
b) = 36.( 28+82) + 64.( 69+41)
= 36.101 + 64.101
=101.( 36+64)
=101.100
=10100
a) 2.31.12+4.6.42+8.27.3
=24.31+24.42+24.27
=24.(31+42+27)
=24.100
=2400
b) 36.28+36.82+64.69+64.41
=36.(28+82)+64.(69+41)
=36.110+64.110
=110.(36+64)
=110.100
=11000
2.31.12+4.6.42+8.27.3
=24.31+24.42+24.27
=24.(31+42+27)
=24.100
=2400
36.28+36.82+64.69+64.41
=36.(28+82)+64.(69+41)
=36.100+64.100
=(36+64).100
=100.100
=10000
a)\(2.31.12+4.6.42+8.27.3\)
\(=24.31+24.42+24.27\)
\(=24.\left(31+42+27\right)\)
\(=24.100\)
\(=2400\)
b)\(36.28+38.82+64.69+64.41\)
\(=36.\left(28+82\right)+64.\left(69+41\right)\)
\(=36.110+64.110\)
\(=110.\left(36+64\right)\)
\(=110.100\)
\(=11000\)
a) 34.15 + 34.85 = 34.(15+85) = 34.100 = 3400
b) 12.57 + 57.25 + 63.57 = 57.(12+25+63) = 57.100 = 5700
c) 36.28 + 36.82 + 64.69 + 64.41 = 36.(28+82) + 64(69+41) = 36.110 + 64.110 = 110.(36+64) = 11000
d) 2.31.12 + 4.6.42 + 8.27.3 = 24.31 + 24.42 + 24.27 = 24.(31+42+27) = 24.100 = 2400
a, 24.31 + 24.42 + 24.27 = 24 ( 31+42+27) =24.100 = 2400
b,36.(28+82)+64(69+41) = 36.110 + 64.110 = 110 (36+64) = 110.100= 11000
a)2.31.12+4.6.42+8.27.3
=2.12.31+24.42+8.3.27
=24.31+24.42+24.27
=24.(31+42+27)
=24.100
=2400
b)36.28+36.82+64.69+64.41
=36.(28+82)+64.(69+41)
=36.100+64.110
=3600+7040
=10640
a) 2.31.12 + 4.6.42 + 8.27.3
= 2.12.31 + 4.6.42 + 8.3.27
=24.31 + 24.42 + 24.27
=24.(31+42+27)
=24.100
=2400
b) 36.28 + 36.82 + 64.69 + 64.41
= 36.(28+82) + 64. ( 69 + 41 )
=36.110 + 64. 110
=(36+64).110
=100.110
=11000
a,2.31.12+4.6.42+8.27.3
=(2.12).31+(4.6).42+(8.3).27
=24.31+24.42+24.27
=24.(31+42+27)
=24.100
=2400
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a, 2.31.12 + 4.6.42 + 8.27.3 = 24.31 + 24.42 + 24.27 = 24.( 31+ 42 +27) = 240
b, 36.28 + 36.82 + 64.69 + 64.41 = 36. ( 28+82 ) + 64.(69+41) = 36.110 +64.110 = 3960 + 7040 = 10000