求解答过程,标下序号
3个回答
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(1)=-8 + 1=-7
(3)=-1.5 + 11.5=10
(5)=15 - [1 - (-24)]=15 - (1+24)
=15 - 25=-10
(7)=22.54 - 4.4 - 12.54 + 4.4
=(22.54 - 12.54)+(4.4 - 4.4)
=10+0=10
(9)=2.4 + 0.6 - 3.1 + 0.8
=3 - 3.1 + 0.8=-0.1 + 0.8
=0.7
(11)=3/4 + 11/6 - 7/3
=9/12 + 22/12 - 28/12
=(9+22-28)/12=3/12=1/4
(13)=-0.1×2×(-100)
=-0.2×(-100)=20
(15)=-8 - 9=-17
(17)=(6/8 - 7/8)×(-8/7)
=-1/8 × (-8/7)=1/7
(3)=-1.5 + 11.5=10
(5)=15 - [1 - (-24)]=15 - (1+24)
=15 - 25=-10
(7)=22.54 - 4.4 - 12.54 + 4.4
=(22.54 - 12.54)+(4.4 - 4.4)
=10+0=10
(9)=2.4 + 0.6 - 3.1 + 0.8
=3 - 3.1 + 0.8=-0.1 + 0.8
=0.7
(11)=3/4 + 11/6 - 7/3
=9/12 + 22/12 - 28/12
=(9+22-28)/12=3/12=1/4
(13)=-0.1×2×(-100)
=-0.2×(-100)=20
(15)=-8 - 9=-17
(17)=(6/8 - 7/8)×(-8/7)
=-1/8 × (-8/7)=1/7
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