X x 20= 50x2

X x20=100

x=100:20

x=5

x.20=100

=>x=100:20=5

f: =20:4+5

=5+5

=10

e: =125-100=25

tự tính

\(a,=75+60-13=122\\ b,=250-25+40=265\\ c,=4+100-9=95\\ d,=45+80-27=98\\ e,=5^3-100=125-100=25\\ g,=5+5=10\)

h h i nữa

\(37.10+37.50+50.2+50\)

\(=37.\left(10+50\right)+50.\left(2+1\right)\)

\(=37.60+50.3\)

\(=2220+150\)

\(=2370\)

=37.(10+50) + 50.(2+1)

=37.60+50.3

=2220+150

2370

\(48\div4+3^9\div3^7+5^0\)

\(=12+9+1\)

\(=22\)

\(\left(5^{19}\div5^{17}+3\right)\div7\)

\(=\left(25+3\right)\div7\)

\(=28\div7\)

\(=4\)

\(295-\left(32-2^2\times5\right)^2\)

\(=295-144\)

\(=151\)

\(6^2\div9+50\times2-3^3\times3\)

\(=36\div9+100-27\)

\(=4+100-27\)

\(=100-27\)

\(=73\)

48:4+39:37+50

=48:4+3²+1

=12+9+1=22

(519:517+3):7

=(5²+3):7

=(25+3):7

=28:7=4

295-(31-22.5)2

=295-(31-4.5)²

=295-(31-20)²

=295-11²

=295-121

=174

62:9+50.2-33.3

=36:9+50.2-3⁴

=4+100-81

=23

tính nhanh thì dùng máy tính

nói thế mình cũng nói được

\(3,8\times2,5< x< 50,2:4\)

\(\Rightarrow9,5< x< 12,55\)

Ta tìm được các giá trị x lần lượt là: 10; 11; 12

\(3,8.2,5< x< 50.\frac{2}{4}\)

\(\Rightarrow9,5< x< 25\)

\(\Rightarrow x\left\{10,11,12,13,14,15,16,17,18,19,20,21,22,23,24\right\}\)

x + 100 = 50 x 2 + 100 - 100 + 200 - 800 + 1 000

x + 100 = 100 + 100 - 100 + 200 - 800 + 1 000

x + 100 = 100 + 200 - 800 + 1 000

x + 100 =    ( -500) + 1 000

x + 100 = 500

x = 500 - 100

x = 400.

x+100=50.2+100-100+200-800+1000

x+100=100+100-100+200-800+1000

x+100=200-100+200-800+1000

x+100=100+200-800+1000

x+100=300-800+1000

x+100=-500+1000

x+100=500

x=500-100

x=400

20 + 20 + 20 + 20 + 20 + 50 + 50 + 50 + 50

= 20 x 5 + 50 x 4

= 100 + 50 x 4

= 100 + 200

= 300

x + 50 - 20 = 50 + 20

x + 50 - 20 = 70

x + 50 = 70 + 20

x + 50 = 90

x = 90 - 50

x = 40

Ủng hộ tíck mik nha !!! 

tính nhanh

20 + 20 + 20 + 20 + 20 + 50 + 50 + 50 + 50

= (20 x 5) + (50 x 4)

=       100  +     200

=          300

tìm x:

x + 50 - 20 = 50 + 20

x + 50 - 20 = 70

x + 50        = 70 + 20

x + 50        = 90

             x   =  90 - 50

             x    = 40

tchs mik tchs lại