⒈
[7/2*(-4)-3*(-1/5)] / [1/4*(8/3)]
⒉
2/5 /(-12/5)-8/21*(-7/4)-1/8
⒊
(-5/2)/(-10)*(-10/3)*(-5)
⒋
(-370)*(-1/4)+0.25*24.5+(-11/2)*(-2590)
⒌
1.25*(-8/7)*(-5/2)*(-8/7)
⒈
[7/2*(-4)-3*(-1/5)] / [1/4*(8/3)]
⒉
2/5 /(-12/5)-8/21*(-7/4)-1/8
⒊
(-5/2)/(-10)*(-10/3)*(-5)
⒋
(-370)*(-1/4)+0.25*24.5+(-11/2)*(-2590)
⒌
1.25*(-8/7)*(-5/2)*(-8/7)
[7/2*(-4)-3*(-1/5)] / [1/4*(8/3)]
={-14+3/5}/{2/3}
=-57/5*3/2
=-17.1
⒉
2/5 /(-12/5)-8/21*(-7/4)-1/8
=2/5*(-5/12)+2/3-1/8
=-1/6+2/3-1/8
=(-1+4)/6-1/8
=1/2-1/8
=3/8
⒊
(-5/2)/(-10)*(-10/3)*(-5)
=(1/4)*(5*10/3)=25/6
或
=(5*10*5)/(2*10*3)
=256/6
⒋
(-370)*(-1/4)+0.25*24.5+(-11/2)*(-2590)
=370/4+24.5/4+11*2590/2
=98.625+11*1295
=98.625+14245
⒌
1.25*(-8/7)*(-5/2)*(-8/7)
=5/4(8/7*5/2)*(-8/7)
=-(5*8*5*8)/(4*7*2*7)
=200/49