-3/4+(-20.125)-6.5+1/8-(-0.75)

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-3/4+(-20.125)-6.5+1/8-(-0.75)-3/4+(-20.125)-6.5+1/8-(-0.75)-3/4+(-20.125)-6.5+1/8-(-0.75)先把分数都化成分数在

-3/4+(-20.125)-6.5+1/8-(-0.75)
-3/4+(-20.125)-6.5+1/8-(-0.75)

-3/4+(-20.125)-6.5+1/8-(-0.75)
先把分数都化成分数在做、、-3/4=0.75 1/8=0.125
-3/4+(-20.125)-6.5+1/8-(-0.75)
=-0.75-20.125-6.5+0.125+0.75
=-20.875-6.5+0.875
=-20-6.5
=-26.5

-26.5
请问你觉得哪里不理解?

-26.5

-26.5

=-0.75-20.125-6.5+0.125+0.75=-20.125-6.5+0.125=-20-6.5=-26.5

解题步骤:先把小数化成分数,再统一分母,后化简,解题就方便许多。
-3/4+(-20.125)-6.5+1/8-(-0.75)
=-3/4-161/8-13/2+1/8+3/4
=-6/8-161/8-52/8+1/8+6/8
=-212/8
=-53/2
完毕!