(1)14-5×2 =9×2 =8
(2)8+20÷4 =28÷4 =7
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( )个( )
□○□=□(元)口诀:________________
( )个( )或( )个( )□○□=□(杯),口诀:________________
□×□=□ □÷□=□□×□=□ □÷□=□口诀:________________