题目内容
用递等式计算(能简便计算的要写出简算过程).
| 6.5×8+8×3.5 | 1210÷[56×(
| 1÷2.5+2.5×0.4 | 168.1÷(4.3×2-
|
(1)6.5×8+8×3.5,
=8×(6.5+3.5),
=8×10,
=80;
(2)1210÷[56×(
-
)],
=1210÷[56×
-56×
],
=1210÷[35-24],
=1210÷11,
=110;
(3)1÷2.5+2.5×0.4,
=0.4+1,
=1.4;
(4)168.1÷(4.3×2-
),
=168.1÷(8.6-0.4),
=168.1÷8.2,
=20.5.
=8×(6.5+3.5),
=8×10,
=80;
(2)1210÷[56×(
| 5 |
| 8 |
| 3 |
| 7 |
=1210÷[56×
| 5 |
| 8 |
| 3 |
| 7 |
=1210÷[35-24],
=1210÷11,
=110;
(3)1÷2.5+2.5×0.4,
=0.4+1,
=1.4;
(4)168.1÷(4.3×2-
| 2 |
| 5 |
=168.1÷(8.6-0.4),
=168.1÷8.2,
=20.5.
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