题目内容
简便方法计算
1.7+5
+3.98
17.625-(4.4+7
)
3.35×6.4×2+6.7×3.6.
1.7+5
| 1 |
| 50 |
17.625-(4.4+7
| 5 |
| 8 |
3.35×6.4×2+6.7×3.6.
(1)1.7+5
+3.98,
=1.7+5.02+3.98,
=1.7+(5.02+3.98),
=1.7+9,
=10.7;
(2)17.625-(4.4+7
),
=17.625-(4.4+7.625),
=17.625-4.4-7.625,
=(17.625-7.625)-4.4,
=10-4.4,
=5.6;
(3)3.35×6.4×2+6.7×3.6,
=3.35×2×6.4+6.7×3.6,
=6.7×6.4+6.7×3.6,
=(6.4+3.6)×6.7,
=10×6.7,
=67.
| 1 |
| 50 |
=1.7+5.02+3.98,
=1.7+(5.02+3.98),
=1.7+9,
=10.7;
(2)17.625-(4.4+7
| 5 |
| 8 |
=17.625-(4.4+7.625),
=17.625-4.4-7.625,
=(17.625-7.625)-4.4,
=10-4.4,
=5.6;
(3)3.35×6.4×2+6.7×3.6,
=3.35×2×6.4+6.7×3.6,
=6.7×6.4+6.7×3.6,
=(6.4+3.6)×6.7,
=10×6.7,
=67.
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