
下面各题,怎样算简便就怎样算. (56-512+524)×481.25×3.2×2.511000÷8÷1251719×(1117×2
下面各题,怎样算简便就怎样算.(56-512+524)×481.25×3.2×2.511000÷8÷1251719×(1117×20-1117)...
下面各题,怎样算简便就怎样算. (56-512+524)×481.25×3.2×2.511000÷8÷1251719×(1117×20-1117)
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(1)(
-
+
)×48
=
×48-
×48+
×48
=40-20+10
=20+10
=30;
(2)1.25×3.2×0.25
=1.25×0.8×4×0.25
=(1.25×0.8)×(0.25×4)
=1×1
=1;
(3)11000÷8÷125
=11000÷(8×125)
=11000÷1000
=11;
(4)
×(
×20-
)
=
×
×20-
×
=
?
=11.
5 |
6 |
5 |
12 |
5 |
24 |
=
5 |
6 |
5 |
12 |
5 |
24 |
=40-20+10
=20+10
=30;
(2)1.25×3.2×0.25
=1.25×0.8×4×0.25
=(1.25×0.8)×(0.25×4)
=1×1
=1;
(3)11000÷8÷125
=11000÷(8×125)
=11000÷1000
=11;
(4)
17 |
19 |
11 |
17 |
11 |
17 |
=
17 |
19 |
11 |
17 |
17 |
19 |
11 |
17 |
=
220 |
19 |
11 |
19 |
=11.
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