题目内容
计算下面各题:
①100+10+20+30 ②100-10-20-30 ③100-30+10.
①100+10+20+30 ②100-10-20-30 ③100-30+10.
①100+10+20+30
=100+(10+20+30),
=100+60,
=160;
②100-10-20-30
=100-(10+20+30),
=100-60,
=40;
③100-30+10
=70+10,
=80.
=100+(10+20+30),
=100+60,
=160;
②100-10-20-30
=100-(10+20+30),
=100-60,
=40;
③100-30+10
=70+10,
=80.
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