脱式计算
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脱式计算
脱式计算
脱式计算
1、原式=(5/4)*(98/13)*8+8*(14/13)*(5/4)-(1/8)*(14/13)*8+(64/13)*(5/4)
=(980+140-14+80)/13
=1186/13;
2、原式=[(19/4)*(8/19)+(44/3)*(10/11)]/[(8.68+4.32)-(0.36+1.64)]
=(2+40/3)/(13-2)
=46/33;
3、原式=(20/9)*(0.8+6.2-5.8-0.2)*(9/10)
=2*(7-6)
=2;
4、原式=[1+1/(1*2)+2]+[2+1/(2*3)+3]+...+[19+1/(19*20)+20]
=(1+2+...+19)+(2+3+...+20)+[(1-1/2)+(1/2-1/3)+...+(1/19-1/20)]
=(1+19)*19/2+(2+20)*19/2+(1-1/20)
=400-1/20.
1.786/13 2.33/46 3.2