\(\text{ 725 : 25 + 525 : 25}\\ =\left(725+525\right):25\\ =1250:25\\ =50\)

\(725:25+525:25\\ =\left(725+525\right):25=1250:25=50\)

\(725:25+525:25\\ =\left(725+525\right):25\\ =1250:25\\ =50\)

\(\frac{725}{25}+\frac{525}{25}=29+21=50\)

thì bn rút gọn là được chứ có khó j đâu

a: =1250:25=50

b: =234(45+55)+234=23400+234=23634

c: =1000x1000=1000000

725 x 28 - 14 x 25 x 2 + 300 x 28 

= 725 x 28 - (14 x 2) x 25 + 300 x 28 

= 725 x 28 - 28 x 25 + 300 x 28 

= 28 x ( 725 - 25 + 300 )

= 28 x 1000

 =28000

72+275 +176 +548 +324 +725 +452+928

=(72+928)+(275+725)+(176+324)+(548+452)

=1000+1000+500+1000

=3500

3500 nha

nhớ k đúng cho mình nhé !

\(a,25\times47\times4\times2=\left(25\times4\right)\times\left(47\times2\right)=100\times94=9400\\ b,865\times99+865=865\times\left(99+1\right)=865\times100=86500\\ c,472\times1002-472-472=472\times\left(1002-1-1\right)=472\times1000=472000\\ d,2478+10275+7522-275=\left(2478+7522\right)+\left(10275-275\right)=10000+10000=20000\)

a 9400

b 86500

c 472000

d 20000

a) 30 + 192 + 70 = 30 + 70 + 192

= 100 + 192 = 292

b) 50 + 794 + 50 = 50 + 50 + 794

= 100 + 794 = 894

c) 75 + 219 + 25 = 75 + 25 + 219

= 100 + 219 = 319

d) 725 + 199 + 125 = 725 + 125 + 199

= 850 + 199 = 1 049