脱式计算.(能简算的要简算)45×3.5+5.5×80%+0.80.5+56×(0.15+9

2025-03-12 09:26:24
推荐回答(1个)
回答1:

(1)
4
5
×3.5+5.5×80%+0.8
=0.8×3.5+5.5×0.8+0.8
=0.8×(3.5+5.5+1)
=0.8×10
=8

(2)0.5+
5
6
×(0.15+
9
20

=0.5+
5
6
×(0.15+0.45)
=0.5+
5
6
×0.6
=0.5+0.5
=1

(3)98.47-(65.47-4.6)-4.6
=98.47-65.47+4.6-4.6
=(98.47-65.47)+(4.6-4.6)
=33+0
=33

(4)
3
4
×
2
7
+0.25×
2
7

=
3
4
×
2
7
+
1
4
×
2
7

=(
3
4
+
1
4
)×
2
7

=1×
2
7

=
2
7