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用简便方法计算;1.2.3*3.14-1.2*3.14+8.9*3.142.2.56*15+14.4*0.5-0.3*1501.2.3*3.14-1.2*3.14+8.9*3.142.2.56*15+
题目内容:
用简便方法计算;1.2.3*3.14-1.2*3.14+8.9*3.14 2.2.56*15+14.4*0.5-0.3*150
1.2.3*3.14-1.2*3.14+8.9*3.14
2.2.56*15+14.4*0.5-0.3*150优质解答
1.2.3*3.14-1.2*3.14+8.9*3.14= (2.3-1.2+8.9)*3.14=10*3.14=31.42.2.56*15+14.4*0.5-0.3*150 = 2.56*15+14.4*0.5-0.3*150 = 2.56*15+1.44*5-3*15 = 2.56*15+0.48*15-3*15 = (2.56+0.48-3)*15 = (3.04-3)*15 =0.04*1... - 追问:
- 是 2.56*15+14.4*1.5-0.3*150
- 追答:
- 2.56*15+14.4*1.5-0.3*150 = 2.56*15+1.44*15-3*15 = (2.56+1.44-3)*15 = (4-3)*15 =1*15 =15
1.2.3*3.14-1.2*3.14+8.9*3.14
2.2.56*15+14.4*0.5-0.3*150
优质解答
- 追问:
- 是 2.56*15+14.4*1.5-0.3*150
- 追答:
- 2.56*15+14.4*1.5-0.3*150 = 2.56*15+1.44*15-3*15 = (2.56+1.44-3)*15 = (4-3)*15 =1*15 =15
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