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计算下面各题,带★用简便方法计算.98+2×1575-75÷5720÷8×9★450÷25★251-132-68★630÷14÷5.

题目详情
计算下面各题,带★用简便方法计算.
98+2×1575-75÷5720÷8×9
★450÷25★251-132-68★630÷14÷5.
▼优质解答
答案和解析
(1)98+2×15
=98+30
=128;

(2)75-75÷5
=75-15
=60;

(3)720÷8×9
=90×9
=810;

(4)450÷25
=(450×4)÷(25×4)
=1800÷100
=18;

(5)251-132-68
=251-(132+68)
=251-200
=51;

(6)630÷14÷5
=630÷(14×5)
=630÷70
=9.