估算下面各题：89×202≈ 361÷59≈ 139×48≈722÷90≈ 307×53≈ 5392÷9≈
10-÷×1
325×0.36+6.75×36
5.6×0.375+×5.4-0.375×0.9
5.6x+4x=17.28
x+=
-
÷
×1
×5.4-0.375×0.9
x+
=
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