脱式计算,能简算的要简算.①1375+450÷15×25 ②137-(23+37) &...
脱式计算,能简算的要简算.①1375+450÷15×25②137-(23+37)③43×99+43④(68-29×176)÷17⑤0.4×8×12.5×14⑥4-65÷(...
脱式计算,能简算的要简算.①1375+450÷15×25 ②137-(23+37) ③43×99+43④(68-29×176)÷17 ⑤0.4×8×12.5×14 ⑥4-65÷(14+18 )
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①1375+450÷15×25,
=1375+30×25,
=1375+750,
=2125;
②1
-(
+
),
=1
-
-
,
=1
-
-
,
=1?
,
=
;
③43×99+43,
=43×(99+1),
=43×100,
=4300;
④(68-
×
)÷17,
=(68-
×
)÷17,
=(68-
)×
,
=68×
-
×
,
=4-
,
=3
;
⑤0.4×8×12.5×
,
=0.4×8×12.5×0.25,
=(0.4×0.25)×(8×12.5),
=0.1×100,
=10;
⑥4-
÷(
+
),
=4-
÷
,
=4-3
,
=
=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 |
=(68-
2 |
9 |
17 |
6 |
=(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 |
=
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