
计算,能简算的用简便方法计算.375+450÷18×20 &...
计算,能简算的用简便方法计算.375+450÷18×209.47+0.58-2.47710×8.4+1.6×0.729÷[821×(13+512)]....
计算,能简算的用简便方法计算.375+450÷18×20 9.47+0.58-2.47 710×8.4+1.6×0.7 29÷[821×(13+512)].
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(1)375+450÷18×20,
=375+25×20,
=375+500,
=875;
(2)9.47+0.58-2.47,
=9.47-2.47+0.58,
=7+0.58,
=7.58;
(3)
×8.4+1.6×0.7,
=0.7×(8.4+1.6),
=0.7×10,
=7;
(4)
÷[
×(
+
)],
=
÷[
×
],
=
÷
,
=
.
=375+25×20,
=375+500,
=875;
(2)9.47+0.58-2.47,
=9.47-2.47+0.58,
=7+0.58,
=7.58;
(3)
7 |
10 |
=0.7×(8.4+1.6),
=0.7×10,
=7;
(4)
2 |
9 |
8 |
21 |
1 |
3 |
5 |
12 |
=
2 |
9 |
8 |
21 |
3 |
4 |
=
2 |
9 |
2 |
7 |
=
7 |
9 |
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