问题
解答题
脱式计算.
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答案
①84÷4-90÷9
=21-10
=11;
②5×11+4
=55+4
=59;
③150-50-30÷5
=150-50-6
=150-56
=94;
④380-(640-25×24)
=380-(640-600)
=380-40
=340;
⑤336÷(25×2+34)
=336÷(50+34)
=336÷84
=4;
⑥(56+13×4)÷12
=(56+52)÷12
=108÷12
=9.