计算下面各题,能简便算的要简算.3.6-2.8+7.4-7.2;    817÷23+123×917+123; &nbsp...

2025-02-27 08:45:44
推荐回答(1个)
回答1:

①3.6-2.8+7.4-7.2
=(3.6+7.4)-(2.8+7.2)
=11-10
=1

8
17
÷23+
1
23
×
9
17
+
1
23

=
8
17
×
1
23
+
1
23
×
9
17
+
1
23

=(
8
17
+
9
17
+1)×
1
23

=2×
1
23

=
2
23


③88×1.01
=88×(1+0.01)
=88×1+88×0.01
=88+0.88
=88.88

④45÷[(13+25 )×411]
=45÷(38×411)
=45÷15618
=
15
5206


⑤(
1
2
+
1
3
)÷
3
5
-
17
18

=
5
6
×
5
3
-
17
18

=
25
18
-
17
18

=
8
18

=
4
9


⑥49×102
=49×(100+2)
=49×100+49×2
=4900+98
=4998