数学简算题,答对加分! 快!
问题描述：
数学简算题,答对加分! 快!
一.(1+1/5-0.1+2/15)*(0.2-1/10+2/15+19/6)-(1+1/5-1/10+2/15+19/6)*(0.2-0.1+2/15)
二.159*(350350350/530530530)-105*(103/104)
三.(59/2)*(2/3)+(128/3)*(3/4)+(197/4)*(4/5)+(296/5)*(5/6)
快点啊！
答
一.(1+1/5-0.1+2/15)*(0.2-1/10+2/15+19/6)-(1+1/5-1/10+2/15+19/6)*(0.2-0.1+2/15)
=(1+1/5-0.1+2/15)*(0.2-1/10+2/15)+(1+1/5-0.1+2/15)*(19/6)-(1+1/5-1/10+2/15)*(0.2-0.1+2/15)
-19/6 *(0.2-0.1+2/15)
=(1+1/5-0.1+2/15)*(19/6)-19/6 *(0.2-0.1+2/15)
=1 *19/6=19/6
二.159*(350350350/530530530)-105*(103/104)
=3x53x(350350350/530530530)-(104+1)(104-1)/104
=3x(350350350/10010010)-(104x104-1)/104
=3x35-104+1/104=105/104
三.(59/2)*(2/3)+(128/3)*(3/4)+(197/4)*(4/5)+(296/5)*(5/6)
=59/3+32+40-3/5+50-2/3
=19-3/5+122
=140.4