题目内容
脱式计算(能简算的要用简算)
| 4.2×7.8+2.2×4.2 | 9.5×101 | (8×3.82)×1.25 | 0.125×72. |
(1)4.2×7.8+2.2×4.2,
=(7.8+2.2)×4.2,
=10×4.2,
=42;
(2)9.5×101,
=9.5×(100+1),
=9.5×100+9.5×1,
=950+9.5,
=959.5;
(3)(8×3.82)×1.25,
=8×3.82×1.25,
=(8×1.25)×3.82,
=10×3.82,
=38.2;
(4)0.125×72,
=0.125×8×9,
=1×9,
=9.
=(7.8+2.2)×4.2,
=10×4.2,
=42;
(2)9.5×101,
=9.5×(100+1),
=9.5×100+9.5×1,
=950+9.5,
=959.5;
(3)(8×3.82)×1.25,
=8×3.82×1.25,
=(8×1.25)×3.82,
=10×3.82,
=38.2;
(4)0.125×72,
=0.125×8×9,
=1×9,
=9.
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