计算下面各题,能简便计算的用简便方法计算.4.82-5.2÷0.8×0.6 [12-(34-35)]÷710 79×511+29×511
计算下面各题,能简便计算的用简便方法计算.4.82-5.2÷0.8×0.6[12-(34-35)]÷71079×511+29×51112.3×9957.5-14.25-1...
计算下面各题,能简便计算的用简便方法计算.4.82-5.2÷0.8×0.6 [12-(34-35)]÷710 79×511+29×511 12.3×99 57.5-14.25-1534 3.2×12.5×0.25.
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(1)4.82-5.2÷0.8×0.6,
=4.82-6.5×0.6,
=4.82-3.9,
=0.92;
(2)[
-(
-
)]÷
,
=[
-
]÷
,
=
÷
,
=
;
(3)
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(4)12.3×99,
=12.3×(100-1),
=12.3×100-12.3×1,
=1230-12.3,
=1217.7;
(5)57.5-14.25-15
,
=57.5-(14.25+15
),
=57.5-30,
=27.5;
(6)3.2×12.5×0.25,
=8×0.4×12.5×0.25,
=(8×12.5)×(0.4×0.25),
=100×0.1,
=10.
=4.82-6.5×0.6,
=4.82-3.9,
=0.92;
(2)[
1 |
2 |
3 |
4 |
3 |
5 |
7 |
10 |
=[
1 |
2 |
3 |
20 |
7 |
10 |
=
7 |
20 |
7 |
10 |
=
1 |
2 |
(3)
7 |
9 |
5 |
11 |
2 |
9 |
5 |
11 |
=(
7 |
9 |
2 |
9 |
5 |
11 |
=1×
5 |
11 |
=
5 |
11 |
(4)12.3×99,
=12.3×(100-1),
=12.3×100-12.3×1,
=1230-12.3,
=1217.7;
(5)57.5-14.25-15
3 |
4 |
=57.5-(14.25+15
3 |
4 |
=57.5-30,
=27.5;
(6)3.2×12.5×0.25,
=8×0.4×12.5×0.25,
=(8×12.5)×(0.4×0.25),
=100×0.1,
=10.
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