题目内容
(1)16×(+0.125)
(2)3×7+6.25÷
(3)1111×37+9999×7
(4)36÷()
解:(1)16×(+0.125),
=16××16+×16,
=15-10+2,
=7;
(2)3×7+6.25÷,
=3.75×7+6.25×7,
=(3.75+6.25)×7,
=10×7,
=70;
(3)1111×37+9999×7,
=1111×37+1111×9×7,
=1111×(37+63),
=1111×100,
=111100;
(4)36÷(),
=36÷,
=36×4,
=144.
分析:(1)把小数化为分数,运用乘法分配律简算;
(2)把3化为小数,把除法改为乘法,运用乘法分配律简算;
(3)把9999写成1111×9,运用乘法分配律简算;
(4)根据数字特点,运用乘法分配律简算.
点评:此题重点考查对乘法分配律的掌握与运用.
=16××16+×16,
=15-10+2,
=7;
(2)3×7+6.25÷,
=3.75×7+6.25×7,
=(3.75+6.25)×7,
=10×7,
=70;
(3)1111×37+9999×7,
=1111×37+1111×9×7,
=1111×(37+63),
=1111×100,
=111100;
(4)36÷(),
=36÷,
=36×4,
=144.
分析:(1)把小数化为分数,运用乘法分配律简算;
(2)把3化为小数,把除法改为乘法,运用乘法分配律简算;
(3)把9999写成1111×9,运用乘法分配律简算;
(4)根据数字特点,运用乘法分配律简算.
点评:此题重点考查对乘法分配律的掌握与运用.
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