\(1) 325+128+12+25\)
\(=(325+25)+(128+12)\)
\(=350+140\)
\(=490\)
\(2) 36,372+63,372+372\)
\(=99,744+372\)
\(=471,744\)
\(3) \frac{8}{19}:\frac{5}{11}+\frac{8}{19}:\frac{6}{11}+\frac{11}{19}\)
\(=\frac{8}{19}.\frac{11}{5}+\frac{8}{19}.\frac{11}{6}+\frac{11}{19}\)
\(=\frac{8}{19}.(\frac{11}{5}+\frac{11}{6})+\frac{11}{9}\)
\(=\frac{8}{19}.\frac{121}{30}+\frac{11}{9}\)
\(= \frac{484}{285}+\frac{11}{9}\)
\(=\frac{2497}{855}\)
~Hok tốt a~
325 + 128 + 12 + 25
= ( 325 + 25 ) + ( 12 + 128 )
= 350 + 140
= 490
36,372 + 63,372 + 372
= 99,744 + 372
= 471,744
\(\frac{8}{19}:\frac{5}{11}+\frac{8}{19}:\frac{6}{11}+\frac{11}{19}\)
\(=\frac{8}{19}:\left(\frac{5}{11}+\frac{6}{11}\right)+\frac{11}{19}\)
\(=\frac{8}{19}:1+\frac{11}{19}\)
\(=\frac{19}{19}=1\)
hok tốt
A) = (325+25)+(128+12)
=350+140
=490
B)=471.744
C)8:(5/11+6/11)+11/19
= 8/19 . 1+11/19
=1
