Question

45 x 6 =

1 + 1 + 2 + 2 + 3 + 3 + 4 + 4 + 5 + 5 + 6 + 6 + 7 + 7 + 8 + 8 + 9 + 9 =

78 : 5 =...(dư...)

45 : 5 =

x : 5 = 25

 

Answer 1

45x6=270

1+1+2+2+3+3+4+4+5+5+6+6+7+7+8+8+9+9

=(1x2)+(2x2)+(3x2)+(4x2)+(5x2)+(6x2)+(7x2)+(8x2)+(9x2)

=2+4+6+8+10+12+14+16+18

=6+6+8+10+12+14+16+18

=12+8+10+12+14+16+18

=20+10+12+14+16+18

=30+12+14+16+18

=42+14+16+18

=56+16+18

=72+18

=90

78:5=15(dư3)

45:5=9

x:5=25

   x= 25x5

   x= 125

tk nhé

Answer 2

45 x 6 = 270

1 + 1 + 2 + 2 + 3 + 3 + 4 + 4 + 5 + 5 + 6 + 6 + 7 + 7 + 8 + 8 + 9 + 9

= 2 + 4 + 6 + 8 + 10 + 12 + 14 + 16 + 18

= ( 2 + 18 ) x 9 : 2

= 90

78 : 5 = 15 ( dư 3 )

45 : 5 = 9

x : 5 = 25

    x  = 25 x 5

    x  = 125

Answer 3

\(45x6=270\)

\(1+1+2+2+3+3+4+4+5+5+6+6+7+7+8+8+9+9\)

\(=1.2+2.2+3.2+4.2+5.2+6.2+7.2+8.2+9.2\)

\(=2+4+6+8+10+12+14+16+18\)

\(=\left(2+18\right)+\left(4+16\right)+\left(6+14\right)+\left(8+12\right)+10\)

\(=10+10+10+10+10\)

\(=10.5\)

\(=50\)

\(78:5=15\left(du3\right)\)

\(45:5=9\)

\(x:5=25\)

       \(x=25.5\)

      \(x=125\)

Answer 4

45 x 6 = 270

cau 2 = 90

78 : 5 = 15(du 3)

45 :5 = 9

x = 5

            tk nhe

Answer 5

45x6=270

1+1+2+2+3+3+4+4+5+5+6+6+7+7+8+8+9+9

=(1x2)+(2x2)+(3x2)+(4x2)+(5x2)+(6x2)+(7x2)+(8x2)+(9x2)

=2+4+6+8+10+12+14+16+18

=6+6+8+10+12+14+16+18

=12+8+10+12+14+16+18

=20+10+12+14+16+18

=30+12+14+16+18

=42+14+16+18

=56+16+18

=72+18

=90

78:5=15(dư3)

45:5=9

x:5=25

   x= 25x5

   x= 125