21页第一大题DBBBAAACDD.第二大题,第一小题26,4,-3.75,-13,-5,-9.第碰或二小题-2第三小题28,28参笑早伍考资料:睁则不一定对( ⊙ o ⊙ )!
(1)(-10)+(+6)
=-(10 - 6 )
=-4
(2)(+12)+(-4)
=+( 12- 4 )
=+8
(3)(-5)+(-7)
=-(5+7)
=-12
(4)(+6)+(-9)
=-(9-6)
=-3
(5)(-0.9)+(-2.7)
=-(0.9+2.7)
=-3.6
(6)5分之2+(-5分之3)
=-(3/5-2/5)
=-1/5
(7)(-3分之1)+5分之2
=+(2/5-1/3)
=+(6/15-5/15)
=+1/15
(8)(-3又4分之1)+(-1又12分之1)
=-(3又4分之1+1又12分之1)
=-(3又3/12+1又1/12)
=-4又1/3
普通可怕的for可怕
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