题目内容
计算:(1)2-5+3-(-4)(2)6+45÷(-3)+2×(-4)
(1)2-5+3-(-4)
=2-5+3+4
=(2+3+4)+(-5)
=9+(-5)
=4;
(2)6+45÷(-3)+2×(-4)
=6+(-15)+(-8)
=6+(-23)
=-(23-6)
=-17.
=2-5+3+4
=(2+3+4)+(-5)
=9+(-5)
=4;
(2)6+45÷(-3)+2×(-4)
=6+(-15)+(-8)
=6+(-23)
=-(23-6)
=-17.
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