=200

duyệt olm k mik nhé

40-5.6-10=24.4

nha!

5.6+2.3=7.9

3.4-2.6=0.8

1.1+2.2=3.3

ai qua nhớ k mình nhé

5.6+2.3

= 30+6

=36

3.4-2.6

=12-12

=0

1.1+2.2

=1+4

=5

19,04:5,6=3,4

(^-^)

19,04 : 5,6 = 3,4

50+100+50+40+10+10+40

=(50+50)+(40+40+10+10)+100

=100+100+100

=100.3

=300

nhae

50 + 100 + 50 + 40 + 10 + 10 + 40

= (50 + 50) + (40 + 10 + 10 + 40) + 100

=     100 + 100 + 100

=          300

41 + 4 + 50 + 10 + 40 + 50 + 40 + 10

= 250

ủng hộ

mk nha!

41+4+50+10+40+50+40+10

=245

chuc bn hoc gioi!

nhae

~~~~~~~~~~~~~~~~~~~

bn

\(\frac{1}{2\cdot3}+\frac{1}{3\cdot4}+\frac{1}{4\cdot5}+\frac{1}{5\cdot6}+\frac{1}{6\cdot7}+\frac{1}{7\cdot8}\)

\(=\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}\)

\(=\frac{1}{2}-\frac{1}{8}=\frac{6}{16}=\frac{3}{8}\)

\(\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}+\frac{1}{6.7}+\frac{1}{7.8}\)

\(=\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{7}-\frac{1}{8}\)

\(=\frac{1}{2}-\frac{1}{8}=\frac{3}{8}\)

40 x 10 + 60 x 10

=10.(40+60)

=10.100

=1 000

40 x 10 + 60 x 10

= (40 + 60) x 10

=    100 x 10

=  1000

=239 

nho h nhe

bằng 239

chúc bạn học giỏi nhé!!!!!!!!!