题目内容
用简便方法计算.
| ①1.25×0.25×32 | ②0.25×3.78×4 | ③6.74×10.1 | ④0.85×99 | ⑤6.8×3.7+6.8×6.3. |
(1)1.25×0.25×32,
=(1.25×8)×(0.25×4),
=10×1,
=10;
(2)0.25×3.78×4,
=(0.25×4)×3.78,
=1×3.78,
=3.78;
(3)6.74×10.1,
=6.74×10+6.74×0.1,
=67.4+0.674,
=68.074;
(4)0.85×99,
=0.85×(100-1),
=0.85×100-0.85×1,
=85-0.85,
=84.15;
(5)6.8×3.7+6.8×6.3,
=6.8×(3.7+6.3),
=6.8×10,
=68.
=(1.25×8)×(0.25×4),
=10×1,
=10;
(2)0.25×3.78×4,
=(0.25×4)×3.78,
=1×3.78,
=3.78;
(3)6.74×10.1,
=6.74×10+6.74×0.1,
=67.4+0.674,
=68.074;
(4)0.85×99,
=0.85×(100-1),
=0.85×100-0.85×1,
=85-0.85,
=84.15;
(5)6.8×3.7+6.8×6.3,
=6.8×(3.7+6.3),
=6.8×10,
=68.
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