题目内容
简便计算
| 14.35+3.98+2.65 | 12.5-8.14-1.86 | 23.1-(12.1-2.46) |
| 125×56 | 56×75+44×75 | 101×43-43. |
(1)14.35+3.98+2.65
=14.35+2.65+3.98
=17+3.98
=20.98;
(2)12.5-8.14-1.86
=12.5-(8.14+1.86)
=12.5-10
=2.5;
(3)23.1-(12.1-2.46)
=23.1-12.1+2.46
=11+2.46
=13.46;
(4)125×56
=125×8×7
=1000×7
=7000;
(5)56×75+44×75
=(56+44)×75
=100×75
=7500;
(6)101×43-43
=(101-1)×43
=100×43
=4300.
=14.35+2.65+3.98
=17+3.98
=20.98;
(2)12.5-8.14-1.86
=12.5-(8.14+1.86)
=12.5-10
=2.5;
(3)23.1-(12.1-2.46)
=23.1-12.1+2.46
=11+2.46
=13.46;
(4)125×56
=125×8×7
=1000×7
=7000;
(5)56×75+44×75
=(56+44)×75
=100×75
=7500;
(6)101×43-43
=(101-1)×43
=100×43
=4300.
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