递等式计算,能简算的要简算.
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递等式计算,能简算的要简算.
①4.8×3.9+6.1×4
①4.8×3.9+6.1×4
4 |
5 |
![递等式计算,能简算的要简算.](/uploads/image/z/2187709-61-9.jpg?t=%E9%80%92%E7%AD%89%E5%BC%8F%E8%AE%A1%E7%AE%97%EF%BC%8C%E8%83%BD%E7%AE%80%E7%AE%97%E7%9A%84%E8%A6%81%E7%AE%80%E7%AE%97%EF%BC%8E)
①4.8×3.9+6.1×4
4
5,
=4.8×3.9+6.1×4.8,
=4.8×(3.9+6.1),
=4.8×10,
=48;
②18
3
5-(2.35+8.6),
=18.6-2.35-8.6,
=18.6-8.6-2.35,
=10-2.35,
=7.65;
③320×125,
=4×80×125,
=4×(80×125),
=4×10000,
=40000;
④1.7+3.98+5
3
10,
=1.7+3.98+5.3,
=1.7+5.3+3.98,
=7+3.98,
=10.98.
4
5,
=4.8×3.9+6.1×4.8,
=4.8×(3.9+6.1),
=4.8×10,
=48;
②18
3
5-(2.35+8.6),
=18.6-2.35-8.6,
=18.6-8.6-2.35,
=10-2.35,
=7.65;
③320×125,
=4×80×125,
=4×(80×125),
=4×10000,
=40000;
④1.7+3.98+5
3
10,
=1.7+3.98+5.3,
=1.7+5.3+3.98,
=7+3.98,
=10.98.