
7×9÷6×7×6÷9用巧算怎么做?
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解:7×9÷6×7×6÷9等于( 49 )
∵已知需求出7×9÷6×7×6÷9等于多少
∴7 × 9 ÷ 6 × 7 × 6 ÷ 9
= 7 × 9 × 1/6 × 7 × 6 × 1/9
= (7 × 7)× (9 × 1/9)× (1/6 × 6)
= 49 × 1 × 1
= 49 × 1
= 49
答:7×9÷6×7×6÷9等于49
∵已知需求出7×9÷6×7×6÷9等于多少
∴7 × 9 ÷ 6 × 7 × 6 ÷ 9
= 7 × 9 × 1/6 × 7 × 6 × 1/9
= (7 × 7)× (9 × 1/9)× (1/6 × 6)
= 49 × 1 × 1
= 49 × 1
= 49
答:7×9÷6×7×6÷9等于49
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