计算(1)0-(+52)(2)(−645)−(−1.8)(3)[(-4)-(+8)]-(-5)(4)1+(−112)−(−13)−(+14).
计算
(1)0-(+52)
(2)(−6)−(−1.8)
(3)[(-4)-(+8)]-(-5)
(4)1+(−1)−(−)−(+).
答案和解析
(1)0-(+52)
=0+(-52)
=-52;
(2)
(−6)−(−1.8)
=(-6.8)+1.8
=-(6.8-1.8)
=-5;
(3)[(-4)-(+8)]-(-5)
=[(-4)+(-8)]+5
=-(4+8)+5
=-12+5
=-(12-5)
=-7;
(4)1+(−1)−(−)−(+)
=1+(−1)++(−)
=(1+)+[(-1)+(-)]
=+(-)
=+(-)
=-(-)
=-.
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