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0.8888x10.4-0.1111x3.2(36963-369.63)除以(24642-246.42)(1+1.8)+(2+1.8x2)+(3+1.8x3)+.+(100+1.8x100)(2.17+5.49+3.81)x(5.49+2.17+9.2)-(3.81+2.17+5.49+9.2)X(2.17+5.49)用简便方法

题目详情
0.8888x10.4-0.1111x3.2
(36963-369.63)除以(24642-246.42)
(1+1.8)+(2+1.8x2)+(3+1.8x3)+.+(100+1.8x100)
(2.17+5.49+3.81)x(5.49+2.17+9.2)-(3.81+2.17+5.49+9.2)X(2.17+5.49)
用简便方法
▼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