题目内容
递等式计算,能简算的用简便方法算:
| 8.46-8.46÷4+4.985 | 43.56÷12.5 | 6.4×3.28+4.6×3.28-3.28 | 99.9×10.1. |
(1)8.46-8.46÷4+4.985,
=8.46-2.115+4.985,
=8.46+(4.985-2.115),
=8.46+2.87,
=11.33;
(2)43.56÷12.5=3.4848;
(3)6.4×3.28+4.6×3.28-3.28,
=(6.4+4.6-1)×3.28,
=10×3.28,
=32.8;
(4)99.9×10.1,
=99.9×(10+0.1),
=999+9.99,
=1000-1+9.99,
=1000+8.99,
=1008.99.
=8.46-2.115+4.985,
=8.46+(4.985-2.115),
=8.46+2.87,
=11.33;
(2)43.56÷12.5=3.4848;
(3)6.4×3.28+4.6×3.28-3.28,
=(6.4+4.6-1)×3.28,
=10×3.28,
=32.8;
(4)99.9×10.1,
=99.9×(10+0.1),
=999+9.99,
=1000-1+9.99,
=1000+8.99,
=1008.99.
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