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用简便方法计算. 100-54.28-25.72 1137+5911+347+1211 87×54+87×46 0.25×64×1.25.

编辑:chaxungu时间:2026-04-27 13:18:50分类:小学数学题库

用简便方法计算.
100-54.28-25.7211
3
7
+5
9
11
+3
4
7
+1
2
11
87×54+87×460.25×64×1.25.
(1)100-54.28-25.72,
=100-(54.28+25.72),
=100-80,
=20;

(2)11
3
7
+5
9
11
+3
4
7
+1
2
11
,
=(11
3
7
+3
4
7
)+(1
2
11
+5
9
11
),
=15+7,
=22;

(3)87×54+87×46,
=87×(54+46),
=87×100,
=8700;

(4)0.25×64×1.25,
=0.25×(8×8)×1.25,
=(0.25×8)×(8×1.25),
=2×10,
=20.