用简便方法计算 (1+1.2)+(2+1.2*2)+(3+1.2*3).(100+1.2*100)=

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用简便方法计算 (1+1.2)+(2+1.2*2)+(3+1.2*3).(100+1.2*100)=
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用简便方法计算 (1+1.2)+(2+1.2*2)+(3+1.2*3).(100+1.2*100)=
用简便方法计算 (1+1.2)+(2+1.2*2)+(3+1.2*3).(100+1.2*100)=

用简便方法计算 (1+1.2)+(2+1.2*2)+(3+1.2*3).(100+1.2*100)=
(1+1.2)+(2+1.2*2)+(3+1.2*3).(100+1.2*100)
=(1+2+3+...+100)+(1.2+1.2*2+...+1.2*100)
=(1+2+3+...+100)+1.2*(1+2+...+100)
=(1+2+3+...+100)*(1+1.2)
=(1+100)*100/2*2.2
=11110