a) \(128+x\times24=4400\)

\(x\times24=4400-128\)

\(x\times24=4272\)

\(x=4272:24\)

\(x=178\)

b) \(125\times\left(x-18\right)=8875\)

\(x-18=8875:125\)

\(x-18=71\)

\(x=71+18\)

\(x=89\)

giup minh voi, nhanh len!!! minh can gap lam!!!

\(...=25x4x\left(7x3+3x4x5+2\right)=100x\left(21+120+2\right)=100x143=14300\)

14300

14300

7 x 12 x25 +3 x 16 x125 +8 x25

=7 x4 x3 x25 +3 x4 x4 x5 x25+4x2x25

=(4 x25) x(7 x3 +3 x4 x5 +2)

= 100 x (21 +60 +2)

= 100 x 83

= 8300

\(a,\left(x-15\right)\times7-270=169\times45\\ \left(x-15\right)\times7-270=7605\\ \left(x-15\right)\times7=7605+270\\ \left(x-15\right)\times7=7875\\ x-15=7875:7\\ x-15=1125\\ x=1125+15\\ x=1140\\ b,64-\left(34\times x-8\right)=4\\ 34\times x-8=64-4\\ 34\times x-8=60\\ 34\times x=60+8\\ 34\times x=68\\ x=68:34\\ x=2\)

\(e,\left(x-2\right).3-270:45=120\)

\(\Rightarrow\left(x-2\right).3-6=120\)

\(\Rightarrow\left(x-2\right).3=126\)

\(\Rightarrow x-2=42\)

\(\Rightarrow x=44\)

Bài làm

a) 16 . 34 + 66 . 16 - 72 

= 16 . ( 34 + 16 ) - 72

= 16 . 80 - 72

= 1280 - 72

= 1208

b) 4,25 . 58,47 + 125  + 41,53 . 4,25

= 4,25 . ( 58,47 + 41,53 ) + 125

= 4,25 . 100 + 125

= 425 + 125

= 550

c) x : 15 + 42 = 15 + 25 . 8 

    x : 15 + 42 = 15 + 200

    x : 15 + 42 = 215

    x : 15         = 215 - 42

    x : 15         = 173

    x                = 173 . 15

    x                = 188

Vậy x = 188

~ Hai câu cuối làm nốt nha, hết thời gian cho một câu hỏi r. ~

# Học tốt #

dễ thương quá minion 

d, X/8*32+X/3*18-X/5*10=120

   X*32/8+X*18/3-X*10/5=120

  32X/8+18X/3-10X/5=120

  4X+6X-2X=120

  8X=120

 X=120/8

X=15

a, ( 25 * 12 - X - 25 ) : 25 = 4

( 25 * 12 - x - 25 )           = 4 * 25 

( 25 * 12 - x - 25 )           = 100

300 - x - 25                    = 100

300 - x                           = 100 + 25

300 - x                           = 125

x                                   = 300 - 125

x                                   = 175

18 x y- y : 0,125 +y x 0,5 - 2 x y x 0,15 =18

18 x y - y x 8 + y x 0,5 - y x 0,3 =18

y x (18-8+0,5-0,3)=18

y x 10,2=18

y= \(\frac{30}{17}\)

\(18\times y-y:0,125+y\times0,5-2\times y\times0,15=18\)

\(\Rightarrow18\times y-y\times8+y\times\frac{5}{10}-2\times y\times0,15=18\)

\(\Rightarrow18\times y-y\times8+y\times\frac{1}{2}-2\times y\times\frac{15}{10}=18\)

\(\Rightarrow18\times y-y\times8+y\times2-2\times y\times\frac{3}{2}=18\)

Tự tìm nhé

15*6*4*125*8=360000

14*25*6*7=14700

24*3*5*10=3600

18*26*25*9=105300

12*5*15*7=6300

15 x 6 x 4 x 125 x 8
= (15 x 4) x (125 x 8) x 6
= 60 x 1000 x 6
= 60000 x 6
= 360000
14 x 25 x 6 x 7
= (14 x 25) x 6 x 7
= 350 x 6 x 7
= 2100 x 7
= 14700
24 x 3 x 5 x 10
= (24 x 5) x 10 x 3
=  120 x 10 x 3
= 1200 x 3
= 3600
18 x 26 x 25 x 9 
= (26 x 25) x 18 x 9
= 650 x 18 x 9
= 11700 x 9
= 105300
12 x 5 x 15 x 7
= (12 x 15) x 5 x 7
= 180 x 5 x 7
= 900 x 7
= 6300