х+350=618, х=618-350, х=268
х-350=618, х=618+350, х=968
х*50=400, х=400:50, х=8
х:50=400, х=400*50, х=20 000
520-х=26, х=520-26, х=494
520:х=26, х=520:26, х=20
х+350=618, х=618-350, х=268
х-350=618, х=618+350, х=968
х*50=400, х=400:50, х=8
х:50=400, х=400*50, х=20 000
520-х=26, х=520-26, х=494
520:х=26, х=520:26, х=20
Х=968
2)x*50=400
x=400/50
x=8
3)x/50=400
x=400*50
x=20000
4)520-x=26
X=520-26
X=494
5)520/x=26
X=20