
脱式计算:(能简算的要简算).①5.6×0.7+0.2×5.6+0.56②1375+450÷18
脱式计算:(能简算的要简算).①5.6×0.7+0.2×5.6+0.56②1375+450÷18×25③917÷7+17×817④91×117+9÷17?1÷17×100...
脱式计算:(能简算的要简算).①5.6×0.7+0.2×5.6+0.56②1375+450÷18×25③917÷7+17×817④91×117+9÷17?1÷17×100.
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①5.6×0.7+0.2×5.6+0.56,
=5.6×0.7+0.2×5.6+5.6×0.1,
=5.6×(0.7+0.2+0.1),
=5.6×1,
=5.6;
②1375+450÷18×25,
=1375+25×25,
=1375+625,
=2000;
③
÷7+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
④91×
+9÷17?1÷17×100,
=91×
+9×
-100×
,
=(91+9-100)×
,
=0×
,
=0.
=5.6×0.7+0.2×5.6+5.6×0.1,
=5.6×(0.7+0.2+0.1),
=5.6×1,
=5.6;
②1375+450÷18×25,
=1375+25×25,
=1375+625,
=2000;
③
9 |
17 |
1 |
7 |
8 |
17 |
=
9 |
17 |
1 |
7 |
1 |
7 |
8 |
17 |
=(
9 |
17 |
8 |
17 |
1 |
7 |
=1×
1 |
7 |
=
1 |
7 |
④91×
1 |
17 |
=91×
1 |
17 |
1 |
17 |
1 |
17 |
=(91+9-100)×
1 |
17 |
=0×
1 |
17 |
=0.
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