C1:

a)    135  x   54    +    45    x  135    +   135

= 135 x ( 54 + 45 + 1)

=135x100=13500

C2

a)    135  x   54    +    45    x  135    +   135

= 7290 + 6075 +135

= 13500

368 - 3(x + 7) = 68

=> 3(x + 7) = 368 - 68

=> 3(x + 7) = 300

=> x + 7 = 300 : 3

=> x + 7 = 100

=> x = 100 - 7

=> x = 93

368-6.(x+7)=68

      6.(x+7)=368-68

      6.(x+7)=300

          (x+7)=300:6

          (x+7)=50

           x      =50-7

           x       =43

3.(x+7)=368-68

3.(x+7)=300

     x+7=300:3

     x+7=100

         x=100-7

         x=93

bn chụp như này thì...

= 2.82883583318376e-14

368:84=5,75

216:59=3,66 có dư

386:48=1237 có dư

169:54=3,12 có dư

a) \(39\times118+29\times82\)

\(=39\times2\times59+29\times2\times41\)

\(=2\times\left(39\times59+29\times41\right)\)

\(=2\times\left(2301+1189\right)\)

\(=2\times3490\)

\(=6980\)

b) \(37\times39+78\times14-13\times85-52\times55\)

\(=37\times3\times13+6\times13\times14+13\times85-4\times13\times55\)

\(=13\times\left(37\times3+6\times14+85-4\times55\right)\)

\(=13\times\left(111+84+85-220\right)\)

\(=13\times\left(280-220\right)\)

\(=13\times60\)

\(=780\)

c) \(368:16+752:16+480:16\)

\(=\left(368+752+480\right):16\)

\(=\left(1120+480\right):16\)

\(=1600:16\)

\(=100\)

d) \(5\times11\times18+9\times31\times10+4\times29\times45\)

\(=5\times11\times9\times2+9\times31\times10+2\times2\times29\times5\times9\)

\(=10\times9\times11+10\times9\times31+10\times29\times2\times9\)

\(=90\times11+90\times31+90\times29\times2\)

\(=90\times\left(11+31+29\times2\right)\)

\(=90\times\left(42+58\right)\)

\(=90\times100\)

\(=9000\)

Answer:

Bài 3:

\(334-\left(-75\right)+[\left(-175\right)-34]\)

\(=334+75-175-34\)

\(=\left(334-34\right)+\left(75-175\right)\)

\(=300+\left(-100\right)\)

\(=200\)

\(68-\left(-45\right)-[368-\left(-145\right)]\)

\(=68+45-[368+145]\)

\(=\left(68-368\right)+\left(45-145\right)\)

\(=\left(-300\right)+\left(-100\right)\)

\(=-400\)

Bài 4:

\(-17-\left(x-5\right)=-52\)

\(\Rightarrow x-5=-17-\left(-52\right)\)

\(\Rightarrow x-5=35\)

\(\Rightarrow x=40\)

\(3\left(7-x\right)+\left(-12\right)=-75\)

\(\Rightarrow3\left(7-x\right)=-75-\left(-12\right)\)

\(\Rightarrow3\left(7-x\right)=-63\)

\(\Rightarrow7-x=-21\)

\(\Rightarrow x=28\)

( x + 8 ) x 16 - x += 368 - 15 = 353

( x + 8 ) x ( 16 - 1 ) = 353

( x + 8 ) x 15 = 353

=> x = 15

(x + 8) x 16 - x + 15 = 368

16x + 128 - x + 15 = 368

15x = 368 - 128 - 15

15x = 225

x = 225/15

x = 15

(Nhớ k cho mình với nhá!)

Ta có: 47 x 31 + 68 x 47 + 47 x 11 = 47 x ( 31 + 68 +11) = 47 x 100 = 4700

151 , ủng hộ mình nha các bạn , có gì sau này mình tick lại cho

2x+189-123

=>2x= 368+123-189

=>2x=302

=>x=151

tick nhé