计算下面各题,能简便计算的要用简便方法计算.125×4÷10-20 7.1×15.4-5.4×7.1 1.25×32×2.5 57
计算下面各题,能简便计算的要用简便方法计算.125×4÷10-207.1×15.4-5.4×7.11.25×32×2.557×34+27÷431÷[12×(65?710)...
计算下面各题,能简便计算的要用简便方法计算.125×4÷10-20 7.1×15.4-5.4×7.1 1.25×32×2.5 57×34+27÷43 1÷[12×(65?710)] (37+35)×7+45.
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(1)125×4÷10-20,
=500÷10-20,
=50-20,
=30;
(2)7.1×15.4-5.4×7.1,
=7.1×(15.4-5.4),
=7.1×10,
=71;
(3)1.25×32×2.5,
=1.25×8×4×2.5,
=(1.25×8)×(4×2.5),
=10×10,
=100;
(4)
×
+
÷
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(5)1÷[
×(
-
)],
=1÷[
×
],
=1÷
,
=4;
(6)(
+
)×7+
,
=
×7+
×7+
,
=3+
+
,
=3+(
+
),
=3+5,
=8.
=500÷10-20,
=50-20,
=30;
(2)7.1×15.4-5.4×7.1,
=7.1×(15.4-5.4),
=7.1×10,
=71;
(3)1.25×32×2.5,
=1.25×8×4×2.5,
=(1.25×8)×(4×2.5),
=10×10,
=100;
(4)
5 |
7 |
3 |
4 |
2 |
7 |
4 |
3 |
=
5 |
7 |
3 |
4 |
2 |
7 |
3 |
4 |
=(
5 |
7 |
2 |
7 |
3 |
4 |
=1×
3 |
4 |
=
3 |
4 |
(5)1÷[
1 |
2 |
6 |
5 |
7 |
10 |
=1÷[
1 |
2 |
1 |
2 |
=1÷
1 |
4 |
=4;
(6)(
3 |
7 |
3 |
5 |
4 |
5 |
=
3 |
7 |
3 |
5 |
4 |
5 |
=3+
21 |
5 |
4 |
5 |
=3+(
21 |
5 |
4 |
5 |
=3+5,
=8.
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