脱式计算,能简算的要简算.①1375+450÷15×25 ②137-(23+37) &...

2025-03-25 07:36:20
推荐回答(1个)
回答1:

①1375+450÷15×25,
=1375+30×25,
=1375+750,
=2125;

②1
3
7
-(
2
3
+
3
7
),
=1
3
7
-
2
3
-
3
7

=1
3
7
-
3
7
-
2
3

=1?
2
3

=
1
3


③43×99+43,
=43×(99+1),
=43×100,
=4300;

④(68-
2
9
×
17
6
)÷17,
=(68-
2
9
×
17
6
)÷17,
=(68-
17
27
)×
1
17

=68×
1
17
-
17
27
×
1
17

=4-
1
27

=3
26
27


⑤0.4×8×12.5×
1
4

=0.4×8×12.5×0.25,
=(0.4×0.25)×(8×12.5),
=0.1×100,
=10;

⑥4-
6
5
÷(
1
4
+
1
8
),
=4-
6
5
÷
3
8

=4-3
1
5

=