计算下列各题,能简便的请用简便方法(1)1880×201.1-187.9×2011(2)25×5÷25×5(3)89×[34?(71
计算下列各题,能简便的请用简便方法(1)1880×201.1-187.9×2011(2)25×5÷25×5(3)89×[34?(716?25%)](4)7.2×61310...
计算下列各题,能简便的请用简便方法(1)1880×201.1-187.9×2011(2)25×5÷25×5(3)89×[34?(716?25%)](4)7.2×61310+73.8×245.
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(1)1880×201.1-187.9×2011,
=188×2011-187.9×2011,
=(188-187.9)×2011,
=0.1×2011,
=201.1;
(2)
×5÷
×5,
=
÷
×5×5,
=1×5×5,
=25;
(3)
×[
?(
?25%)],
=
×[
-(
?
)],
=
×[
?
],
=
×
,
=
;
(4)7.2×61
+73.8×2
,
=7.2×61.3+73.8×2.8,
=441.36+206.64,
=648.
=188×2011-187.9×2011,
=(188-187.9)×2011,
=0.1×2011,
=201.1;
(2)
2 |
5 |
2 |
5 |
=
2 |
5 |
2 |
5 |
=1×5×5,
=25;
(3)
8 |
9 |
3 |
4 |
7 |
16 |
=
8 |
9 |
3 |
4 |
7 |
16 |
1 |
4 |
=
8 |
9 |
3 |
4 |
3 |
16 |
=
8 |
9 |
9 |
16 |
=
1 |
2 |
(4)7.2×61
3 |
10 |
4 |
5 |
=7.2×61.3+73.8×2.8,
=441.36+206.64,
=648.
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