a)37.75+37.45+63.67+63.53
b)35.34+35.86+65.75+65.45
c)78.31+78.24+78.17+22.72
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\(a,\)\(42.53+47.156-47.114\)
\(42.53+47\left(156-114\right)\)
\(=42.53+47.42\)
\(=42\left(53+47\right)\)
\(=42.100\)
\(=4200\)
\(b,\)\(35.13+35.17+65.75-65.45\)
\(=35\left(13+17\right)+65\left(75-45\right)\)
\(=35.30+65.30\)
\(=30\left(35+65\right)\)
\(=30.100\)
\(=3000\)
a) 37.75+37.45+63.67+63.53
= 37.(75 + 45) + 63.(67 + 53)
= 37 . 120 + 63 . 120
= 120 . (37 + 63)
= 120 . 100
= 12 000
78.31+22.72+78.24+78.17
=78.(31+24+17)+22.72
=78.72+22.72
=(78+22).72
=100.72
=7200
78.31+22.72+78.24+78.17
=78.(31+24+17)+22.72
=78.72+22.72
=(78+22).72
=100.72
=7200
=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
a, -78(31+24+17)+22.72=-78.72+22.72=72.(-78+22)=-4032
b, -15,5.(20,8+9,2)+3,5.(9,2+20,8)=(-15,5+3,5).(20,8+9,2)=-12.30=-360
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
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
a) 37 .75+37 .45+63 .67+63 .5337 .75+37 .45+63 .67+63 .53
=37 .(75+45)+63 .(67+53)=37 .(75+45)+63 .(67+53)
=37 .120+63 .120=37 .120+63 .120
=(37+63) .120=(37+63) .120
=100 .120=100 .120
=12000
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 ❤❤❤