Ta có : 0,52 . 99 + 0,34 + 0,18

         = 0,52 . 99 + ( 0 ,34 + 0,18)

         = 0,52 . 99 + 0,52.1

         = 0,52 . ( 99 + 1 )

         = 0,52 . 100 

         = 52

0,52 x 99 + 0,34 + 0,18

= 0,52 x 99 + ( 0,34 + 0,18 )

= 0,52 x 99 + 0,52

= 0,52 x ( 99 + 1 )

= 0,52 x 100

= 52

Hok tốt !

Ta có : 101 x 0,34 - 0,34

       = 0,34 x ( 101 - 1 )

       = 0,34 x 100

       = 34

= ( 101 -1 ) x 34

= 100 x 34

= 3400

\(\text{a) 7,25 x 0,34 + 2,75 x 0,34}\\ =0,34.\left(7,25+2,75\right)\\ =0,34.10\\ =3,4\)

\(\text{b) 10,79 x 0,24 – 0,24 x 0,79 }\\ =0,24.\left(10,79-0,79\right)\\ =0,24.10\\ =2,4\)

99x0,34+0,34

=99x1x0,34+0,34

=0,34x(99+1)

=0,34x100

=34

#Hok_tốt

99x0,34+0,34

=99x0,34+0,34x1

=(99+1)x0,34

=100x0,34

=34.

​          #Nguyễn Kim Ngân#

6: \(9,5\times4,7+9,5\times4,3+9,5\)

\(=9,5\times\left(4,7+4,3+1\right)\)

\(=9,5\times10=95\)

5: \(32\times1,25\times2,5+0,476+0,524\)

\(=80\times1,25+1\)

=100+1

=101

4: \(3,5\times0,5+3,5\times0,125+3,5\times22,5\times4\)

=3,5x(90+0,5+0,125)

=3,5x90,625

=317,1875

3: \(32\times1,25\times2,5+\frac{54}{10}\times8,7+5,4\times3,3-10,8\)

\(=40\times2,5+5,4\times8,7+5,4\times3,3-5,4\times2\)

=100+5,4x(8,7+3,3-2)

=100+5,4x10

=100+54

=154

2: \(15,25\times0,5+15,25\times0,25+15,25\times0,125+15,25\times6\)

=15,25x(0,5+0,25+0,125+6)

=15,25x6,875

=104,84375

1: 2020x0,56+0,34x6060+8080x0,85+2020x5,02

=2020x0,56+2020x1,02+2020x3,4+2020x5,02

=2020x(0,56+1,02+3,4+5,02)

=2020x10

=20200

\(34,4\times12-34,4:0,5\)

\(=34,4\times12-34,4\times2\)

\(=34,4\times\left(12-2\right)\)

\(=34,4\times10\)

\(=344\)

34,4 \(\times\) 12 - 34,4: 0,5

= 34,4 \(\times\) 12 - 34,4 \(\times\) 2

= 34,4 \(\times\) ( 12 - 2)

= 34,4 \(\times\) 10

= 344

C1:2,04x1,19:0,34=2,4276:0,34=7,14

C2:2,04x1,19:0,34=2,04x3,5=7,14

C3:2,04x1,19:0,34=2,04:0,34x1,19=6x1,19=7,14

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