mk nghĩ là 

1135:5+865:5-18.9-18

=(1135+865):5-18.(9-1)

=400-144

=256

CHÚC BẠN HỌC GIỎI

(nếu đúng nhớ mk nha! cảm ơn)

1135 : 5 + 865 : 5 - 18 x 9 - 18

= (1135 + 865) : 5 - 162 - 18

= 2000 : 5 - 162 - 18

= 400 - 162 - 18

= 400  - (162 + 18)

= 220

1135:5+865:5-18.9-18

=227+173-162-18

=400-162-18

=238-18

=228

\(1135:5+865:5-18\times9-18=227+173-162-18=\left(227+173\right)-\left(162+18\right)=400-180=220\)

\(1135:5+865:5-18\times9-18\)

\(=\left(1135:5\right)+\left(865:5\right)-\left(18\times9\right)-18\)

\(=227+173-162-18=400-162-18=238-18=220\)

1135 : 5 + 865 : 5 - 18 x 9 -18
= 227 + 173 - 162 - 18
= 220

\(\frac{13}{18}\times\frac{9}{26}\times\frac{2}{3}=\frac{13}{2\times9}\times\frac{9}{13\times2}\times\frac{2}{3}=\frac{1}{2\times3}=\frac{1}{6}\)

\(a.1,25\times5\times6,3\div0,125\times2\\ =\left(5\times2\right)\times\left(1,25\div0,125\right)\times6,3\\ =10\times10\times6,3=630\)

\(b.12,5\times6,9+0,1\times6,9\times865\times6,9\\ =6,9\times\left(12,5+86,5+1\right)\\ =6,9\times100=690\)

(976 + 865) + 135 = 976 + (865 + 135)

= 976 + 1000 = 1976

1976

16/9

34/13

1976

16/9

34/13

1976

16/9

34/13

544 + 135 + 157 + 843 + 865 + 456 =   ( 544 + 456 ) + ( 135 + 865 ) + ( 157 + 834 ) =   1000 + 1000 + 1000   =   3000

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

a 9400

b 86500

c 472000

d 20000