\(d)\)\(43.78-43.48+30.80-30.23\)

\(=\)\(43.\left(78-48\right)+30.\left(80-23\right)\)

\(=\)\(43.30+30.57\)

\(=\)\(30.\left(43+57\right)\)

\(=\)\(30.100\)

\(=\)\(3000\)

\(43\times78-43\times48+30\times80-30\times23\)

\(=43\left(78-48\right)+30\times80-30\times23\)

\(=43\times30+30\times80-30\times23\)

\(=30\left(43+80-23\right)=30.100=3000\)

D)43.78-43.48+30.80-30.23

=43.(78-48)+30.(80-23)

=43.30+30.57

=30.(43+57)

=30.100

=3000

=(33+27)+(6+14)+(78-6)

=60+20+72

=80+72

=152

33 + 6 + 78 + 14 + 27 - 6 =

( 33 + 27 ) + ( 6 + 14 ) + 78 - 6 = 

60 + 20 + 72 = 

152 !

33+6+78+14+27-6

=(33+27)+(6+14)+(78-6)

=60+30+72

=90+72

=162

nho k cho mk nhe?

174 nhé bạn 

184 nha k mình đi mình trả lời đầu tiên đó 

= [43+67] +[46+34]-6

=110+80-6

=190-6

=184

56 + 44 - 4 + 68 - 6

=   100   - 4 + 68 - 6

=       96      + 68 - 6

=             164     - 6

=                158

=158 nhé

k cho mình nha

56+44-4 +68-6= 100-4+62= 158

1)

\(45\left(13+78\right)+9\left(87+22\right)5\)

\(=45\left(13+78\right)+45\left(87+22\right)\)

\(=45\left(13+78+87+22\right)\)

\(=45\left[\left(87+13\right)+\left(78+22\right)\right]\)

\(=45\left[100+100\right]\)

\(=45.200\)

\(=9000\)

2)

\(43+37+93.43+57.61+69.57\)

\(=43\left(37+93\right)+57.\left(61+69\right)\)

\(=43.130+57.130\)

\(=130\left(43+57\right)\)

\(=130.100\)

=13000

1 ) 3 x ( 4 + ? ) = 18

<=> 4 + ? = 18 : 3

<=> 4 + ? = 6 

<=> ? = 6 - 4

=> ? = 2

2 ) 32 x 78 + 32 x 22

= 32 x ( 78 + 22 )

= 32 x 100

= 3200

3 x ( 4 + ? ) = 18 

4 + ? = 18 :  3

4 + ? = 6

?  = 6  - 4 

? = 2

tính nhanh

32 x 78 + 32 x 22

= 78 x ( 32 + 22 ) 

= 78 x 54 

= 4212

dap an la 6

dap an la 3200
 

 nho nha

65x25x35x35+25

=25x(64+35+1)

=25x100

=2500

chúc bạn học giỏi nha!!! :))

   64 x 25 + 35 x 25 + 25

 = 25 x ( 64 + 35 + 1 )

= 25 x 100

= 2500

=64x25x35x25+25x1

=25x(64+35+1)

=25x100

2500

\(1+2+3+4+5+...+28+29=\left(1+29\right).29:2=435\)

(1+29)+(2+28)+(3+27)+(4+26)+(5+25)+(6+24)+(7+23)+(8+22)+(9+21)+(10+20)+(11+19)+(12+18)+(13+17)+(14+16)+15

=30+30+30+30+30+30+30+30+30+30+30+30+30+30+15

=30x14+15

=435

435

bạn lấy số đầu cộng số cuối được bao nhiêu cộng với 15

x - 43 = ( 57 - x ) - 50

x - 43 = 57 - x - 50

x + x  = 57 - 50 + 43

2x      = 50

  x      = 25