Question

1.Tính bằng cách thuận tiện nhất :

a)20/11 x 33/23 x 69/180 =...

b)0,8 x 96 + 0,8 x2 x2=...

Mong mn giúp ạ!

Answer 1

a)

\(\frac{20}{11}.\frac{33}{23}.\frac{69}{180}\)

\(=\left(\frac{20}{11}.\frac{69}{180}\right).\frac{33}{23}\)

\(=\frac{23}{33}.\frac{33}{23}=1\)

b)  0,8 x 96 + 0,8 x 2 x 2

=0,8 x ( 96+2+2)

=0,8 x 100

= 80

Answer 2

a) 20/11 x 33/23 x 69/180 = 60/23 x 69/180 = 1

b) 0,8 x 96 + 0,8 x 2 x 2 = 0,8 x ( 96 + 2 ) x 2 = 0,8 x 98 x 2 = 78,4 x 2 = 156,8

Answer 3

a)=\(\frac{20}{11}\).\(\frac{33}{23}\).\(\frac{23}{60}\)

=\(\frac{20}{11}\).(\(\frac{33}{23}\).\(\frac{23}{60}\))

=\(\frac{20}{11}\).\(\frac{759}{1380}\)

=\(\frac{20}{11}\).\(\frac{11}{20}\)

=1

b)=0,8.96+0,8.4

=0,8.(96+4)

=0,8.100

80

Answer 4

cảm ơn bn!