能简算的要简算
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能简算的要简算
能简算的要简算
能简算的要简算
数理答疑团为您解答
78× 78/79
=(79-1)×78/79
=78 - 78/79
=77又1/79
8÷9× 7/9 ÷ 1/81
=8× 1/9 × 7/9× 81
=8×1×7
=56
0.6×6/7+3/5×3/7-2/7×60%
=0.6×6/7+0.6×3/7- 2/7×0.6
=0.6×(6/7+ 3/7- 2/7)
=0.6× 1
=0.6
78×79/79-78×79/1
收起
第一题78÷79/78,所以等于79