脱式计算(能简算的要用简便方法计算): ①80÷(1-84%) ②5-5× 2 5 +

脱式计算(能简算的要用简便方法计算): ①80÷(1-84%) ②5-5× 2 5 + 3 5 ③0.25×32×12.5% ④ 7 9 ÷ 11 5 + 2 9 × 5 11 .

①80÷(1-84%),
=80÷0.16,
=500;

②5-5×
2
5
+
3
5

=5-2+
3
5

=3
3
5


③0.25×32×12.5%,
=0.25×4×8×0.125,
=(0.25×4)×(8×0.125),
=1×1,
=1;

7
9
÷
11
5
+
2
9
×
5
11

=
7
9
×
5
11
+
2
9
×
5
11

=(
7
9
+
2
9
)×
5
11

=1×
5
11

=
5
11
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