计算,越快越好,加分!!!!!!!!!!十万火急!!!!!!!! 25乘3/4减(-25)乘1/2+25乘(-1/4)
49又13/14乘(-7)(2/3减1/10+1/6减2/5)除以(-1/60)78乘(-2/3)+(-2/3)乘(-11)+(+34)乘2/3...
49又13/14乘(-7)
(2/3减1/10+1/6减2/5)除以(-1/60)
78乘(-2/3)+(-2/3)乘(-11)+(+34)乘2/3 展开
(2/3减1/10+1/6减2/5)除以(-1/60)
78乘(-2/3)+(-2/3)乘(-11)+(+34)乘2/3 展开
展开全部
25乘3/4减(-25)乘1/2+25乘(-1/4)
=25*(3/4+1/2-1/4)
=25*1
=25
49又13/14乘(-7)
=-(50-1/14)*7
=-350-1/2
=-349又1/2
(2/3减1/10+1/6减2/5)除以(-1/60)
=-2/3*60+1/10*60-1/6*60+2/5*60
=-40+6-10+24
=-20
78乘(-2/3)+(-2/3)乘(-11)+(+34)乘2/3
=2/3*(-78+11+34)
=2/3*(-33)
=-22
=25*(3/4+1/2-1/4)
=25*1
=25
49又13/14乘(-7)
=-(50-1/14)*7
=-350-1/2
=-349又1/2
(2/3减1/10+1/6减2/5)除以(-1/60)
=-2/3*60+1/10*60-1/6*60+2/5*60
=-40+6-10+24
=-20
78乘(-2/3)+(-2/3)乘(-11)+(+34)乘2/3
=2/3*(-78+11+34)
=2/3*(-33)
=-22
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