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2. 24-1 =23
3. 90-20+240= 310
= 1 + 6 - 0,8
= 7 - 0,8
= 6,2
2. 12 x 2 - 2 : 2
= 24 - 1
= 23
3. 90 - 20 + 40 x 6
= 70 + 240
= 310