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\(a,142\times12+142\times18=142\times\left(12+18\right)=142\times30=4260\\ b,49\times365-39\times365=365\times\left(49-39\right)=365\times10=3965\\ c,4\times18\times25=\left(4\times25\right)\times18=100\times18=1800\)
a) 142 x 12 + 142 x 18
=142x(12+18)
=142x30
=4260
b) 49 x 365 - 39 x 365
=(49-39)x365
=10x365
=3650
c) 4 x 18 x 25
=4x25x18
=100x18
=1800
`5/9+5/11+4/9+4/11+2/11`
`=(5/9+4/9)+(5/11+4/11+2/11)`
`=9/9+11/11`
`=1+1`
`=2`
= ( 2020 + 2020 ) + ( 2020 + 2020 ) - ( 2020 x 4 )
= 4040 + 4040 - 8080
= 8080 - 8080
= 0
346 x 3005 - 3005 x 246
= 3005 x ( 346 - 246)
= 3005 x 100
= 300 500
346 x 3005 - 3005 x 246
= 3005 x ( 346 - 246)
= 3005 x 100
= 300 500
\(\frac{5}{11}.\frac{7}{25}+\frac{15}{11}.\frac{1}{5}\)
\(=\frac{5}{11}.\frac{7}{25}+\frac{5}{11}.3.\frac{1}{5}\)
\(=\frac{5}{11}.\frac{7}{25}+\frac{5}{11}.\frac{3}{5}\)
\(=\frac{5}{11}\left(\frac{7}{25}+\frac{3}{5}\right)\)
\(=\frac{5}{11}\left(\frac{7}{25}+\frac{15}{25}\right)\)
\(=\frac{5}{11}.\frac{22}{25}=\frac{2}{5}\)
a, 2 x 9 x 5 x 7 x 4 x 25
= 23 x 32 x 53 x 7
= 63000
b, 6 x 14 x 5 x 25 x 3 x 4
= 24 x 32 x 53 x 7
= 126000
a) 2x9x5x7x4x25
= (2x5)x(4x25)x(9x7)
= 10x100x63
= 63000
b) 2x14x5x25x3x4
= (2x5)x(4x25)x(14x3)
= 10x100x42
= 42000
11003 + 1677 + 1969 + 1031 + 1323 - 1003
= ( 11003 - 1003 ) + ( 1677 + 1323 ) + ( 1969 + 1031 )
= 10000 + 3000 + 3000
= 13000 + 3000
= 16000
a) \(=23.\left(1305-305\right)\)
\(=23.1000\)
\(=23000\)
b) \(=57.\left(84+15+1\right)\)
\(=57.100\)
\(=5700\)
a,1305x23-305x23
=(1305-305)x23
= 1000x23
= 23000
b,84x57+15x57+57
=84x57+15x57+57x1
=(84+15+1)x57
= 100x57
=5700