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a) \(136+326+64\)
\(=\left(136+64\right)+326\)
\(=200+326\)
\(=526\)
b) \(69+\left(31+57\right)\)
\(=\left(69+31\right)+57\)
\(=100+57\)
\(=157\)
c) \(755+321+145+179\)
\(=\left(755+145\right)+\left(321+179\right)\)
\(=900+500\)
\(=1400\)
d) \(17+123+378+583+122\)
\(=\left(17+583\right)+\left(378+122\right)+123\)
\(=600+500+123\)
\(=1100+123\)
\(=1223\)
c) \(\left(11+12+13+...+19\right).\left(6.8-48\right)=\left(11+12+13+...+19\right).\left(48-48\right)\)
\(=\left(11+12+13+...+19\right).0\)
\(=0\)
Hok "tuốt" nha^^
b) \(\left(500.9-250.18\right).\left(1+2+3+...+9\right)=\left(250.2.9-250.18\right).\left(1+2+...+9\right)\)
\(=\left(250.18-250.18\right).\left(1+2+3+...+9\right)\)
\(=0.\left(1+2+3+...+9\right)\)
\(=0\)
Hok tốt nha^^ (lần 2)
145,46 - 356,64 : 16 + 37,009
= 145,46 - 22,29 + 37,009
= 123,35 + 37,009
= 160,359
132*145+100-145*133+15
=145(132-133)+115
=-145+115=-30<0
=>132*145+100<145*133-15
`a)145×16+145×83+123×22`
`=145xx(16+83)+123xx22`
`=145xx99+123xx22`
`=145xx9xx11+123xx2xx11`
`=1305xx11+246xx11`
`=(1305+246)xx11`
`=1551xx11`
`=`\(17061\)
`145 xx 16 + 145 xx 83 + 123 xx 22`
`=145 xx (16 +83) + 123xx 22`
`=145 xx 99+123xx22`
`=145 xx 9 xx 11+123 xx 21 xx 1`
` = (1305+246) xx 11`
`=1551 xx 11 =17061`