有理数数学题几道
(-1/6-1/8+1/4-1/12)÷(-1/48)
=(-1/6-1/8+1/4-1/12)×(-48)
=1/6×48+1/8×48-1/4×48+1/12×48
=8+6-12+4
=6
(-1) 2007次幂 +(-3) 2次幂乘【-2/9】-4的 2次幂÷(-2)二次幂
=-1+9×(-2/9)-16÷4
=-1-2-4
=-7
2/5÷(-2又2/5)-8/21乘(1又3/4)-0.5乘2乘1/2
=-1/6-2/3-1/2
=-5/6-1/2
=-4/3
有理数数学题几道
(-1/6-1/8+1/4-1/12)÷(-1/48)
=(-1/6-1/8+1/4-1/12)×(-48)
=1/6×48+1/8×48-1/4×48+1/12×48
=8+6-12+4
=6
(-1) 2007次幂 +(-3) 2次幂乘【-2/9】-4的 2次幂÷(-2)二次幂
=-1+9×(-2/9)-16÷4
=-1-2-4
=-7
2/5÷(-2又2/5)-8/21乘(1又3/4)-0.5乘2乘1/2
=-1/6-2/3-1/2
=-5/6-1/2
=-4/3