Реши уравнения: x + 450 = 700 280 - a = 190 x · 30 = 60 240 : x = 80 x - 350 = 240 291 +...

Question

Реши уравнения:

x + 450 = 700
280 - a = 190
x · 30 = 60
240 : x = 80

x - 350 = 240
291 + a = 652
x : 30 = 9
70 · x = 490

Answer 1

x + 450 = 700
х=700-450
х=250

280 - a = 190
а= 280-190
а=90

x · 30 = 60
х=60:30
х=2

240 : x = 80
х=240:80
х=3

x - 350 = 240
х=240+350
х=590

291 + a = 652
а=652-291
х=361

x : 30 = 9
х=9*30
х=270

70 · x = 490
х=490:70
х=7

Answer 2

X + 450 = 700
Х=700-450
Х=250
_______
250+450=700
700=700

280 - a = 190
а=280-190
а=90
------------
280-90=190
190=190

x · 30 = 60
Х=60÷30
Х=2
---------'
2×30=60
60=60

240 : x = 80
Х=240÷80
Х=3
-------------
240÷3=80
80=80

x - 350 = 240
Х=240+350
Х=590
-------------
590-350=240
240=240


291 + a = 652
а=652-291
а=361
------'-------
291+361=652
652=652

x : 30 = 9
Х=30×9
Х=270
--------------
270÷30=9
9=9

70 · x = 490
Х=490÷70
Х=7
-----'----
70×7=490
490=490