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a) -2021.371+2021-(-629)
=2021.(-371)+2021+629
=2021.[-371+1]+629
=2021.(-370)+629
=-747770+629
=-747141
b) 957.(-37)-137.(-957)
=957.(-37)+137.957
=957.[-37+137]
=957.100
=95700
d) (451-527)+(527-741-451)
=451-527+527-741-451
=(451-451)+(-527+527)-741
=0+0-741
=-741
e) (-632+129)-(-17-632+129)
=-632+129+17+632-129
=(-632+632)+(129-12)+17
=0+0+17
=17
a, 28(231+69)+72(231+69)
=231+69.(28+72)
=231+69.100
=231+6900
=7131
b, 39(250+87)+64(240+97)
=39.337+64.337
=337(39+64)
=337.103
=34711
1) 12.2.25+29.25+59.25
=24.25+29.25+59.25
=25(24+29+59)
=25.112
=2800
2) 25.(231+69)+72.(231+69)
=25.300+72.300
=300(25+72)
=300.97
=29100
3) 39.(250+87)+64.(240+97)
=39.337+64.337
=337.(39+64)
=337.103
=34711
4) 36.28+36.82+64.69+64.41
=36.(28+82)+64.(69+41)
=36.110+64.110
=110(36+64)
=110.100
=11000
1) 12 x 2 x 25 + 29 x 25 + 59 x 25
= 24 x 25 + 29 x 25 + 59 x 25
= 25 x ( 24 + 29 + 59 )
= 25 x 112
= 2800
2) 25 x ( 231 + 69 ) + 72 x ( 231 + 69 )
= 25 x 300 + 72 x 300
= ( 25 + 72 ) x 300
= 29100
3)39 x ( 250 + 87 ) + 64 x ( 240 + 97 )
= 39 x 337 + 64 x 337
= ( 39 + 64 ) x 337
= 103 x 337
= 34711
tính nhanh
1) 12.2.25+29.25+59.25
2) 25.(231+69)+72.(231+69)
3) 39.(250+87)+64.(240+97)
4) 36.28+36.82+64.69+64.41
1) 12 x 2 x 25 + 29 x 25 + 59 x 25
= 24 x 25 + 29 x 25 + 59 x 25
= 25 x ( 24 + 29 + 59 )
= 25 x 112
= 2800
2) 25 x ( 231 + 69 ) + 72 x ( 231 + 69 )
= 25 x 300 + 72 x 300
= ( 25 + 72 ) x 300
= 29100
3)39 x ( 250 + 87 ) + 64 x ( 240 + 97 )
= 39 x 337 + 64 x 337
= ( 39 + 64 ) x 337
= 103 x 337
= 34711
\(\frac{377}{-231}-\frac{123}{89}-\frac{34}{791}.\left(\frac{1}{6}-\frac{1}{8}-\frac{1}{16}\right)\)
a) \(28.\left(231+69\right)+72.\left(169+31\right)=28.300+72.200\)
\(=100.\left(28.3+72.2\right)=100.\left(84+144\right)=100.228=22800\)
b) \(39.\left(250+87\right)+61\left(240+97\right)=39.337+61.337\)
\(=337.\left(39+61\right)=337.100=33700\)
a ) 1 12 + 2 3 + − 3 4 = 1 12 + 8 12 + − 9 12 = 0
b ) 1 2 − 2 5 + − 7 10 = 5 10 − 4 10 + − 7 10 = − 6 10 = − 3 5 c ) 1 2 + − 3 7 + 5 2 + − 4 7 = 1 2 + 5 2 + − 3 7 + − 4 7 = 2 d ) 9 8 − 4 7 + − 1 8 + 11 7 = 9 8 + − 1 8 + − 4 7 + 11 7 = 2 e ) 6 11 + − 2 3 + 5 11 = 6 11 + 5 11 + − 2 3 = 1 3 f ) − 1 2 + 11 4 − 11 4 − 1 2 = − 1 2 + 11 4 − 11 4 + 1 2 = 0
\(\left(527-34\right)+\left(-150+34-527\right)\)
\(=527-34-150+34-527=\left(527-527\right)+\left(-34+34\right)-150=-150\)
\(367+\left|-550\right|+\left|-33\right|-248-\left|-202\right|\)
\(=367+550+33-248-202=\left(367+33\right)-\left(248+202\right)+550=500\)
\(231.72+769.87+231.15=231\left(72+15\right)+769.87=87\left(231+769\right)=87000\)