Ответ:
450 + a= 920- 40
450+а=880
а=880-450
а=440
х- 340 = 180 + 20
х=200+340
х=540
y:6 = 63:7
у÷6=9
у=6×9
у=63
8•b= 100 - 68
8b=32
b=32÷8
b=4
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Ответ:
450 + a= 920- 40
450+а=880
а=880-450
а=440
х- 340 = 180 + 20
х=200+340
х=540
y:6 = 63:7
у÷6=9
у=6×9
у=63
8•b= 100 - 68
8b=32
b=32÷8
b=4