\(151\times24-48\times13-24\times25\\ =151\times24-24\times2\times13-24\times25\\ =151\times24-24\times26-24\times25\\ =24\times\left(151-26-25\right)\\ =24\times100\\ =2400\)

151 x 24 - 48 x 13 - 24 x 25

= 3624 - 624 - 600

= 3000 - 600

= 2400

\(3\times\frac{24}{13}+2\times\frac{3}{13}=\frac{72}{13}+\frac{6}{13}=\frac{78}{13}=6\)

3x24/13+2x3/13

=3x8x3/13+2x3/13

=24x3/13+2x3/13

=3/13x(24+2)

=3/13x26

=6

Lời giải:

a.

$23+23\times 45+23\times 44=23\times (1+45+44)=23\times 90$

$=23\times (100-10)=23\times 100-23\times 10=2300-230=2070$

b.

$=36\times 280-36\times 79-36$

$=36\times (280-79-1)=36\times (280-80)=36\times 200=7200$

c.

$=72\times 10+72\times 25+72\times 66-72$

$=72\times (10+25+66-1)=72\times 100=7200$

a) 35 x 12 + 65 x 13

= 35 x 12 + 65 x (12+1)

=35 x 12 + 65 x 21 + 65

=12 x (65 + 35) + 65

= 12 x 100 + 65

= 1200 + 65

= 1265

b) (37 x 13 -13) : (24 + 37 x 12)

= [ 37 x (12+1) - 13 ] :  (24 + 37 x 12)

=( 37 x 12 + 37 - 13) : ( 24 +37 x 12)

=( 37 x 12 +24) : (24 + 37 x 12)

=\(1\)

Ta có nhận xét phần b hai tích chia cho nhau mà 2 tích giống nhau vậy kết quả là \(1\)

35 x 12 + 65 x 13 = 1265

( 37 x 13 - 13) : (24 + 37 x 12) = 1

a) 35 x 12 + 65 x 13 = 420 + 845

                              = 1265

b) ( 37 x 13 - 13 ) : (24 + 37 x 12) = 468 : 468

                                                 = 1

\(x-\left(13-x\right)=-24+\left(-7+x\right)\)

\(x-13+x=-24+\left(-7\right)+x\)

\(x+x-x=-24+\left(-7\right)+13\)

\(x=-18\)

X + 8 = 24

x= 24 − 8

X = 16

X − 13 = 47

X = 47 + 13

X = 60

=> x-13+x=-24-7+x

=> 2x-13=x-31

=> 2x-x=-31+13

=> x=-18

Vậy x=-18

Tk mk nha 

\(x-24=-114+23\)

\(< =>x-24=-101\)

\(< =>x=-101+24\)

\(< =>x=-77\)

Vậy .............

x - 24 = -114 + 13

x - 24 = -101

x        = -101 + 24

x        = -77