题目内容
脱式计算,能简算的要简算.
99×0.375+0.375 | (10+120÷10)×9 | 5.64+4.97+0.03. |
10.93-3.74-4.26 | 480÷(144-960÷8)24×25. |
分析:(1)运用乘法分配律简算;
(2)先算括号内的除法,再算括号内的加法,最后算乘法;
(3)运用加法结合律简算;
(4)运用减法的性质简算;
(5)先算括号内的除法,再算括号内的减法,最后算括号外的除法;
(6)把24看作6×4,运用乘法结合律简算.
(2)先算括号内的除法,再算括号内的加法,最后算乘法;
(3)运用加法结合律简算;
(4)运用减法的性质简算;
(5)先算括号内的除法,再算括号内的减法,最后算括号外的除法;
(6)把24看作6×4,运用乘法结合律简算.
解答:解:(1)99×0.375+0.375,
=(99+1)×0.375,
=100×0.375,
=37.5;
(2)(10+120÷10)×9,
=(10+12)×9,
=22×9,
=198;
(3)5.64+4.97+0.03,
=5.64+(4.97+0.03),
=5.64+5,
=10.64;
(4)10.93-3.74-4.26,
=10.93-(3.74+4.26),
=10.93-8,
=2.93;
(5)480÷(144-960÷8),
=480÷(144-120),
=480÷24,
=20;
(6)24×25,
=6×4×25,
=6×(4×25),
=6×100,
=600.
=(99+1)×0.375,
=100×0.375,
=37.5;
(2)(10+120÷10)×9,
=(10+12)×9,
=22×9,
=198;
(3)5.64+4.97+0.03,
=5.64+(4.97+0.03),
=5.64+5,
=10.64;
(4)10.93-3.74-4.26,
=10.93-(3.74+4.26),
=10.93-8,
=2.93;
(5)480÷(144-960÷8),
=480÷(144-120),
=480÷24,
=20;
(6)24×25,
=6×4×25,
=6×(4×25),
=6×100,
=600.
点评:考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
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