几道简算题8

问题描述:

几道简算题8
1.(362+548×361)/(362×548-186)
2.(1988+1989×1987)/(1988×1989-1)
3.(204+584×1991)/(1992×584―380)―1/143

1.(362+548×361)/(362×548-186)= (362+548×361)/(361×548+548-186)= (362+548×361)/(361×548+362)= 12.(1988+1989×1987)/(1988×1989-1)= (1988+1989×1987)/(1987×1989+19...