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a) 37.75+37.45+63.67+63.53
= 37.(75+45)+63.(67+53)
= 37.120+63.120
= 120.(37+63)
= 120.100
= 12000
b) 35.34+35.86+65.75+65.45
= 35.(34+86)+65.(75+45)
= 35.120+65.120
=120.(35+65)
= 120.100
= 12000
c) 78.31+78.24+78.17+22.72
= 78.(31+24+17)+22.72
= 78.72+22.72
= 72.(78+22)
= 72.100
= 7200
b) 35⋅34+35⋅86+65⋅75+65⋅45=35(34+86)+65(75+45)=35⋅120+65⋅120=(35+65)⋅120=100⋅120=12000
c) 78 . 31 + 78 . 24 + 78 . 17 + 22 . 72
= 78 . ( 31 + 24 + 17 ) + 22 . 72
= 78 . 72 + 22 . 72
= 72 . ( 78 + 22 )
= 72 .100
= 7200
chúc bạn học tốt ❤❤❤
\(a,17.93+116.83+17.23\)
\(=17.\left(93+23\right)+116.83\)
\(=116.\left(17+83\right)\)
\(=116.100\)
\(=11600\)
\(b,19.27+47.81+19.20\)
\(=19.\left(27+20\right)+47.81\)
\(=47.\left(19+81\right)\)
\(=47.100\)
\(=4700\)
\(c,87.23+13.93+70.87\)
\(=87.\left(23+70\right)+13.93\)
\(=93.\left(87+13\right)\)
\(=93.100\)
\(=9300\)
\(d,78.31+78.24+78.17+22.72\)
\(=78.\left(31+24+17\right)+22.72\)
\(=72.\left(78+22\right)\)
\(=78.100\)
\(=7800\)
=78.(31+24+17)+22.72
=78.72+22.72
=72.(78+22)
=72.100
=7200
l.i.k.e mình nha ngo anh tu
78.31+78.24+78.17+22.72
=78.(31+24+17)+22.72
=78.72+22.72
=72.(78+22)
=72.100
=7200
Ta có: 78.31+78.24+78.17+22.72
= 78.(31 + 24 + 17) + 22.72
= 78 .72 + 22.72
= 72.(78 + 22)
= 72. 100
= 7200
78.31+78.24+78.17+22.72
= 78 .(31+24+17)+22.72
= 78 . 72 +22.72
= 72 .(78+22)
= 72 . 100
= 7200
Dấu (.) là nhân nha
\(a,\)\(42.53+47.156-47.114\)
\(42.53+47\left(156-114\right)\)
\(=42.53+47.42\)
\(=42\left(53+47\right)\)
\(=42.100\)
\(=4200\)
\(b,\)\(35.13+35.17+65.75-65.45\)
\(=35\left(13+17\right)+65\left(75-45\right)\)
\(=35.30+65.30\)
\(=30\left(35+65\right)\)
\(=30.100\)
\(=3000\)