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计算(能简算的要简算.)①(13+57×125)÷[(4-223)×3]②5.6×334+425×3.75③17.8-5.12÷45-3.6.

题目详情
计算(能简算的要简算.)
①(
1
3
+
5
7
×1
2
5
)÷[(4-2
2
3
)×3]
②5.6×3
3
4
+4
2
5
×3.75
③17.8-5.12÷
4
5
-3.6.
▼优质解答
答案和解析
①(
1
3
+
5
7
×1
2
5
)÷[(4-2
2
3
)×3],
=(
1
3
+
5
7
×
7
5
)÷[
4
3
×3],
=(
1
3
+1)÷4,
=
4
3
×
1
4

=
1
3

②5.6×3
3
4
+4
2
5
×3.75,
=5.6×3.75+4.4×3.75,
=3.75×(5.6+4.4),
=3.75×10,
=37.5;
③17.8-5.12÷
4
5
-3.6,
=17.8-5.12÷0.8-3.6,
=17.8-6.4-3.6,
=17.8-(6.4+3.6),
=17.8-10,
=7.8.