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(2
2
9
×
4
25
+0.84×2
2
9
)÷[4.375-(2
3
8
+1
7
12
)]
(2
2
9
×
4
25
+0.84×2
2
9
)÷[4.375-(2
3
8
+1
7
12
)]
=(
4
25
+0.84)×2
2
9
÷[4.375-(2
3
8
+1
7
12
)],
=1×2
2
9
÷[4.375-(2.375+1
7
12
)],
=2
2
9
÷[4-1
7
12
],
=2
2
9
÷2
5
12

=1
1
87
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