1/84/7+12.55/7简便运算

题目详情

1/8*4/7+12.5*5/7简便运算

▼优质解答

答案和解析

1/8×4/7+12.5×5/7
=1/8×4/7+100/8×5/7
=1/8×4/7+1/8×500/7
=1/8×(4/7+500/7)
=1/8×504/7
=63/7
=9

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