题目内容
简便计算
| 23.1-(12.1-2.46) | 14.35+3.98+2.65 | 12.5-8.14-1.86 |
| 125×56 | 56×75+44×75 | 101×43-43. |
①23.1-(12.1-2.46 )
=23.1-12.1+2.46
=11+2.46
=13.46
②14.35+3.98+2.65
=(14.35+2.65)+3.98
=17+3.98
=20.98
③12.5-8.14-1.86
=12.5-(8.14+1.86)
=12.5-10
=2.5
④125×56
=125×8×7
=1000×7
=7000
⑤56×75+44×75
=75×(56+44)
=75×100
=7500
⑥101×43-43
=(101-1)×43
=100×43
=4300
=23.1-12.1+2.46
=11+2.46
=13.46
②14.35+3.98+2.65
=(14.35+2.65)+3.98
=17+3.98
=20.98
③12.5-8.14-1.86
=12.5-(8.14+1.86)
=12.5-10
=2.5
④125×56
=125×8×7
=1000×7
=7000
⑤56×75+44×75
=75×(56+44)
=75×100
=7500
⑥101×43-43
=(101-1)×43
=100×43
=4300
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