1) х*6=912
х=912:6
х=152
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152*6=912
912=912
2) 42:х=63:3
42:х=21
х=42:21
х=2
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42:2=63:3
21=21
3) 848+х=908
х=908-848
х= 60
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848+60=908
908=908
4) 75:х=14+11
75:х=25
х=75:25
х=3
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75:3=14+11
25=25
5) 273:х=7
х = 273:7
х= 39
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273:39=7
7=7
6) 5*4*3:2*х=45*2
30*х = 90
х= 90:30
х=3
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5*4*3:2*3=45*2