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用简便方法计算下面各题,急0.8888*10.4-0.1111*3.2(36963-369.63)/(24642-246.42)(1+1.8)+(2+1.8*2)+(3+1.8*3)+···+(100+1.8*100)(2.17+5.49+3.81)*(5.49+2.17+9.2)-(3.18+2.7+5.49+9.2)*(2.17.5.49)
题目详情
用简便方法计算下面各题,急
0.8888*10.4-0.1111*3.2
(36963-369.63)/(24642-246.42)
(1+1.8)+(2+1.8*2)+(3+1.8*3)+···+(100+1.8*100)
(2.17+5.49+3.81)*(5.49+2.17+9.2)-(3.18+2.7+5.49+9.2)*(2.17.5.49)
0.8888*10.4-0.1111*3.2
(36963-369.63)/(24642-246.42)
(1+1.8)+(2+1.8*2)+(3+1.8*3)+···+(100+1.8*100)
(2.17+5.49+3.81)*(5.49+2.17+9.2)-(3.18+2.7+5.49+9.2)*(2.17.5.49)
▼优质解答
答案和解析
1.0.8888*10.4-0.1111*3.2
=0.1111*8*10.4-0.1111*3.2=0.1111*(83.2-3.2)=0.1111*80=8.888
2.(36963-369.63)/(24642-246.42)
=369.63*(100-1)/246.42*(100-1)=369.63/246.42=(246.42+123.21)/246.42=1+0.5=1.5
3.(1+1.8)+(2+1.8*2)+(3+1.8*3)+···+(100+1.8*100)
=(1+2+3+...+100)+1.8*(1+2+3+...+100)=(1+2+3+...+100)*(1+1.8)=【100*(1+100)】/2*2.8=5050*2.8=14140
4.题目不正确吧?
=0.1111*8*10.4-0.1111*3.2=0.1111*(83.2-3.2)=0.1111*80=8.888
2.(36963-369.63)/(24642-246.42)
=369.63*(100-1)/246.42*(100-1)=369.63/246.42=(246.42+123.21)/246.42=1+0.5=1.5
3.(1+1.8)+(2+1.8*2)+(3+1.8*3)+···+(100+1.8*100)
=(1+2+3+...+100)+1.8*(1+2+3+...+100)=(1+2+3+...+100)*(1+1.8)=【100*(1+100)】/2*2.8=5050*2.8=14140
4.题目不正确吧?
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