用递等式计算,能简算的要用简便方法计算.84.67-(24.67+15.3)1.25×3.2 1 4 + 3 4

用递等式计算,能简算的要用简便方法计算.84.67-(24.67+15.3)1.25×3.2 1 4 + 3 4 ÷ 1 4 + 3 4 1 5 ÷13+ 4 5 × 1 13 .

(1)84.67-(24.67+15.3),
=84.67-24.67-15.3,
=(84.67-24.67)-15.3,
=60-15.3,
=44.7;

(2)1.25×3.2,
=1.25×8×0.4,
=(1.25×8)×0.4,
=10×0.4,
=4;

(3)
1
4
+
3
4
÷
1
4
+
3
4

=(
1
4
+
3
4
)+
3
4
×4,
=1+3,
=4;

(4)
1
5
÷13+
4
5
×
1
13

=
1
5
×
1
13
+
4
5
×
1
13

=(
1
5
+
4
5
)×
1
13

=1×
1
13

=
1
13
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