问几道数学计算题①(-6)×(-0.25)×11/14②-7×(-3)×(-0.5)+(-12)×(-2.6)

问题描述:

问几道数学计算题
①(-6)×(-0.25)×11/14
②-7×(-3)×(-0.5)+(-12)×(-2.6)

(1)原式=-6*-1/4*11/14=3/2*11/14=33/28
(2)原式=-7*-3*-1/2+(-12)*(-13/5)=-21/2+(12*13)/5=207/10=20.7

第一道=1.5×11/14=1.65/14=0.117857
第二道=21×(-0.5)+(-12)×(-2.6)=-10.5+31.2=20.7

①(-6)×(-0.25)×11/14
原式=(-6)×(-1/4)×11/14
=3/2×11/14
=33/28
②-7×(-3)×(-0.5)+(-12)×(-2.6)
原式=(-7)×(-3)×(-1/2)+(-12)×(-13/5)
=(-21/2)+(12×13)/5
=207/10
=20.7