
脱式计算.((2)(4)题用简便算法计算并写出简算过程)(1)〔6.9÷(3.26-0.96)+4.5〕×11(2)1.8
脱式计算.((2)(4)题用简便算法计算并写出简算过程)(1)〔6.9÷(3.26-0.96)+4.5〕×11(2)1.8×73.5+27.5×1.8-1.8(3)25×...
脱式计算.((2)(4)题用简便算法计算并写出简算过程)(1)〔6.9÷(3.26-0.96)+4.5〕×11(2)1.8×73.5+27.5×1.8-1.8(3)25×〔7-4÷(215+23)〕(4)2425×10152011-485×992011.
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(1)[6.9÷(3.26-0.96)+4.5]×11,
=[6.9÷2.3+4.5]×11,
=[3+4.5]×11,
=7.5×11,
=82.5;
(2)1.8×73.5+27.5×1.8-1.8,
=(73.5+27.5-1)×1.8,
=100×1.8,
=180;
(3)
×[7?4÷(
+
)],
=
×[7?4÷
],
=
×[7?4×
],
=
×[7?5],
=
×2,
=
;
(4)
×
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×
,
=
×(
+
)?
×
,
=
×
+
×
-
×
,
=
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,
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×
,
=
.
=[6.9÷2.3+4.5]×11,
=[3+4.5]×11,
=7.5×11,
=82.5;
(2)1.8×73.5+27.5×1.8-1.8,
=(73.5+27.5-1)×1.8,
=100×1.8,
=180;
(3)
2 |
5 |
2 |
15 |
2 |
3 |
=
2 |
5 |
4 |
5 |
=
2 |
5 |
5 |
4 |
=
2 |
5 |
=
2 |
5 |
=
4 |
5 |
(4)
24 |
25 |
1015 |
2011 |
48 |
5 |
99 |
2011 |
=
24 |
25 |
990 |
2011 |
25 |
2011 |
48×5 |
5×5 |
99 |
2011 |
=
24 |
25 |
990 |
2011 |
24 |
25 |
25 |
2011 |
24×10 |
25 |
99 |
2011 |
=
24 |
25 |
990 |
2011 |
24 |
2011 |
24 |
25 |
10×99 |
2011 |
=
24 |
25 |
990 |
2011 |
24 |
2011 |
24 |
25 |
990 |
2011 |
=
24 |
2011 |
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