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\(234.25+75.234\)
\(=234.\left(25+75\right)\)
\(=234.100\)
\(=23400\)
a)
\(\dfrac{1}{2}=0,5;\dfrac{3}{4}=0,75;\dfrac{7}{5}=1,4;\dfrac{9}{8}=1,125;\dfrac{26}{25}=1,04;\dfrac{120}{125}=0,96\)
b)
\(\dfrac{15}{25}=0,6;\dfrac{75}{25}=3;\dfrac{90}{300}=0,3;\dfrac{27}{36}=0,75;\dfrac{51}{85}=0,6\)
a,1/2=5/10;3/4=75/100;7/5=140/100;26/25=108/100;120/125=960/1000
b,15/25=60/100;75/25=300/100;90/300=3/10;27/36=3/4=75/100;
51/85=3/5=60/100;39/65=3/5=60/100
a . 297+150:(493-47.10+7 b, 728:(73.3,54+0,17.25+3,54.27+0,23.25
=297+150:(493-470+7) =728:[(73.3,54+3,54.27)+(0,23.25+0,17.25)]
=297+150:30 =728:[3,54.(73+27)+25.(0,17+0,23)]
=297+5 =728:(3,54.100+25.0,4)
=302 =728:(354+10)
=728:364
=2
'.' là dấu phẩy
a: \(=27\left(77+15\right)+27\cdot8\)
\(=27\cdot92+27\cdot8=27\cdot100=2700\)
b: \(=75\cdot89+75\cdot9+2\cdot75=75\left(89+9+2\right)=75\cdot100=7500\)
c: \(=0.25\left(42.9-11.7+0.8\right)=0.25\cdot32=8\)
d: 738 phút=12,3 giờ
= 27 x [ 75 \(+\)25 ] - 150
= 27 x 100 - 150
= 2700 - 150
= 2550
27 x 75 + 25 x 27 - 150
= 2025 + 675 - 150
= 2700 - 150
= 2550