50 - 100÷2=, 5 - 10÷2=, 125 - 1000÷8 =, 25 - 100÷4=, 100 - 25×4=, 1000000 - 1000×1000=, 1000 - 250×4=, 20 - 5×4=, 10 - 90÷9 =, 11 - 77÷7 =,

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