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2 x 6
1/2 × 800
5× 24
1/5x100-10=20
4 x ... = 8
... = 8 : 4 = 2
2 x ... = 36 : 3
2 x ... = 12
... = 12 : 2 = 6
( 1/2 x ... ) -25 = 25 x 17
( 1/2 x ... ) -25 = 425
1/2 x ... = 425 + 25
1/2 x ... = 450
... = 450 x 2 = 900
( 10 : 1/2 ) x ... = 120
5 x ... = 120
... = 120 : 5 = 24
( 1/2 x ... ) - 10 = 5 x 4
1/2 x ... = 20 + 10
... = 30 x 2 = 60