ok

1,5:0,2-1,5:0,5+1,5:0,25+1,25

=1,5:(0,2-0,5+1,5+1,5)

=1,5:2,7

=0,55

1,5:0,2-1,5:0,5+1,5:0,25+1,25

=1,5:(0,2-0,5+1,5+0,25)+1,5

=1,5:2,7+1,5

=2.05

7,8x1,5+1,2x1,5+1,5

=7,8x1,5+1,2x1,5+1,5x1

=1,5x(7,8+1,2+1)

=1,5x10

=15

  7,8x1,5+1,2x1,5+1,5

=7,8x1,5+1,2x1,5+1,5x1

=1,5x(7,8+1,2+1)

=1,5x10

=15

15                   

   7,8*1,5+1,2*1,5+1,5

= (7,8+1,2+1)*1,5

= 10*1,5

= 15

Chúc bạn HT : >

\(\text{ 7,8*1,5+1,2*1,5+1,5 = (7,8+1,2+1)*1,5 = 10*1,5 = 15}\)

\(1,5.\left(8,6+0,4+1\right)=1,5.10=15\)

(1,5 x 7,5 + 1,5 x 3 - 1,5 ) x 3,86 x (4,5 - 9:2)

= (1,5 x 7,5 + 1,5 x 3 - 1,5 x 1) x 3,86 x (4,5 - 4,5)

= [1,5 x (7,5 + 3 - 1)] x 3,86 x (4,5 - 4,5)

= (1,5 x 9,5) x 3,86 x 0

= 0

\(\left(1,5\times7,5+1,5\times3-1,5\right)\times3,86\times\left(4,5-9\div2\right)\\ =\left(1,5\times7,5+1,5\times3-1,5\times1\right)\times3,86\times\left(4,5-4,5\right)\\ =\left[1,5\times\left(7,5+3-1\right)\right]\times3,86\times\left(4,5-4,5\right)\\ =\left(1,5\times9,5\right)\times3,86\times0\\ =0\)

10

\(213:1,5-198:1,5\)

\(=\left(213-198\right):1,5\)

\(=15:1,5\)

\(=10\)

=10

-2 

1.5 + 1,5 -2 + (-3) = -2

-2

=1,5*3,6+1,5*2,4+2,5*4

=1,5*(3,6+2,4+4)

=1,5*10

15

1,5*3,6+1,5*2,4+1,5*4=1,5*(3,6+2,4+4)=1,5*10=15

1,5x3,6+1,5x2,4+1,5:0,25

=1,5x3,6+1,5x2,4+1,5x4

=1,5x(3,6+2,4+4)=1,5x10=15