用递等式计算(能简算的要简算)798+10570÷35 103×2.5×910×4 187×99 2.5÷[(17.2-4.5×3.6)
用递等式计算(能简算的要简算)798+10570÷35103×2.5×910×4187×992.5÷[(17.2-4.5×3.6)÷0.04]24×(23-14+512)...
用递等式计算(能简算的要简算)798+10570÷35 103×2.5×910×4 187×99 2.5÷[(17.2-4.5×3.6)÷0.04] 24×(23-14+512) 4.63×75%+6.47×34-0.75.
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(1)798+10570÷35
=798+302,
=1100;
(2)
×2.5×
×4
=(
×
)×(2.5×4),
=3×10,
=30;
(3)187×99
=187×(100-1),
=187×100-187×1,
=18700-187,
=18513;
(4)2.5÷[(17.2-4.5×3.6)÷0.04]
=2.5÷[(17.2-16.2)÷0.04],
=2.5÷[1÷0.04],
=2.5÷25,
=0.1;
(5)24×(
-
+
)
=24×
-24×
+24×
,
=16-6+10,
=20;
(6)4.63×75%+6.47×
-0.75.
=4.63×0.75+6.47×0.75-0.75,
=(4.63+6.47-1)×0.75,
=10.1×0.75,
=7.575.
=798+302,
=1100;
(2)
10 |
3 |
9 |
10 |
=(
10 |
3 |
9 |
10 |
=3×10,
=30;
(3)187×99
=187×(100-1),
=187×100-187×1,
=18700-187,
=18513;
(4)2.5÷[(17.2-4.5×3.6)÷0.04]
=2.5÷[(17.2-16.2)÷0.04],
=2.5÷[1÷0.04],
=2.5÷25,
=0.1;
(5)24×(
2 |
3 |
1 |
4 |
5 |
12 |
=24×
2 |
3 |
1 |
4 |
5 |
12 |
=16-6+10,
=20;
(6)4.63×75%+6.47×
3 |
4 |
=4.63×0.75+6.47×0.75-0.75,
=(4.63+6.47-1)×0.75,
=10.1×0.75,
=7.575.
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