问题
解答题
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答案
(1)
x=7 8 21 40
x×7 8
=8 7
×21 40 8 7
x=3 5
(2)X+
X=7 9 4 3
X=16 9 4 3
X×16 9
=9 16
×4 3 9 16
X=3 4
(3)
x÷3 4
=181 6
x÷3 4
×1 6
=18×1 6 1 6
x=33 4
x×3 4
=3×4 3 4 3
x=4