基础强化第1题答案
b + a;b x a
a+(b+c);a x(b x c)
a x c + b x c;a -(b + c)
基础强化第2题答案
①137+63+29
=200+29
=229
②11x(20x5)
=11x100
=1100
③35x2x9
=70x9
=630
④29x(200-2)
=29x200-29x2
=5800-58
=5742
⑤57x(99+1)
=57x100
=5700
⑥29x(132-32)
=29x100
=2900
拓展应用第3题答案
(1)一共有:(26 + 23) × 6 =294(人)
(2)共有:8 x (26 + 24)=400(人)
答:共有400人参加兴趣小组