Ответ: 1) 1000-910=90х=90 90÷9=1000-91090=902) 1000-910х=9090×9=1000-910 3)
Ответ: 1) x:9 = 1000-910x:9 = 90x = 90*9x = 1802) x*9 = 1000-910x*9 = 90x = 90:9x = 103) 100*x = 2430-2030100*x = 400x = 400:100x = 44) 100:x = 2430-2420100:x = 10x = 100:10x = 10