\(x\cdot98:0,5=2017\)

        \(x\cdot98=2017\cdot0,5\)

        \(x\cdot98=1008,5\)

                 \(x=1008,5:98\)

                 \(x=\frac{2017}{196}\)

chúc bn học giỏi

3;-3 đúng 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000%

x + 50 = 100 + 20

x + 50 = 120

x = 120 - 50

x = 70 

câu 1 : 5 + 5 + 5 + 5=\(5\cdot4\)

=20

câu 2 : 1 + 1 + 1 + 1 + 1 + 1 + 1+ 1 + 1 + 1 =\(1\cdot10\)=10

k mk nhé mk sẽ kết bạn với bạn

x + 100 = 200 - 500 

x + 100 = - 300

x = - 300 - 100

x = - 400

x - 100 = 200 - 300

x + 800 = 1000

x = 1000 - 800

x = 200
K mk nha

Mk k lại

=9000 nha 

tk mk nha

= 0 + 7890

= 7890

CHÚC BẠN HỌC GIỎI NHA !