1.) 3 × 7 × 23
= ( 3 × 7 ) × 23
= 21 × 23
= 483
2.) 3 × 12 × 20
= ( 3 × 12 ) × 20
= 36 × 20
= 720
3.) 11 × 11 × 43
= ( 11 × 11 ) × 43
= 121 × 43
= 5.203
4.) 123 × (-17)
= -( 123 × 17 )
= (-2.091)
5.) 125 × (-21) × 7
= -( 125 × 21 )
= (-2.625) × 7
= (-18.375)
6.) 144 ÷ 12 ÷ 3
= ( 144 ÷ 12 ) ÷ 3
= 12 ÷ 3
= 4
7.) 420 ÷ (-7) ÷ 12
= -( 420 ÷ 7 ) ÷ 12
= -(60 ÷ 12)
= (-5)
8.) (-108) ÷ 4 ÷ 3
= -( 108 ÷ 4 ) ÷ 3
= -( 27 ÷ 3 )
= (-9)
9.) 225 ÷ 5 - (-9)
= ( 225 ÷ 5) - (-9)
= 45 - (-9)
= 45 + 9
= 54
10.) 550 ÷ (-10) ÷ (-5)
= -(550 ÷ 10) ÷ (-5)
= (-55) ÷ (-5)
= 55 ÷ 5
= 11
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1.) 3 × 7 × 23
= ( 3 × 7 ) × 23
= 21 × 23
= 483
2.) 3 × 12 × 20
= ( 3 × 12 ) × 20
= 36 × 20
= 720
3.) 11 × 11 × 43
= ( 11 × 11 ) × 43
= 121 × 43
= 5.203
4.) 123 × (-17)
= -( 123 × 17 )
= (-2.091)
5.) 125 × (-21) × 7
= -( 125 × 21 )
= (-2.625) × 7
= (-18.375)
6.) 144 ÷ 12 ÷ 3
= ( 144 ÷ 12 ) ÷ 3
= 12 ÷ 3
= 4
7.) 420 ÷ (-7) ÷ 12
= -( 420 ÷ 7 ) ÷ 12
= -(60 ÷ 12)
= (-5)
8.) (-108) ÷ 4 ÷ 3
= -( 108 ÷ 4 ) ÷ 3
= -( 27 ÷ 3 )
= (-9)
9.) 225 ÷ 5 - (-9)
= ( 225 ÷ 5) - (-9)
= 45 - (-9)
= 45 + 9
= 54
10.) 550 ÷ (-10) ÷ (-5)
= -(550 ÷ 10) ÷ (-5)
= (-55) ÷ (-5)
= 55 ÷ 5
= 11