题目内容
脱式计算:(能用简便方法就用简便方法)
15.64-2.53-7.47;
3.7+6.3÷0.6-0.4;
3.5÷〔(0.45-0.38)×0.1〕;
5.6×7.2+4.4×7.2.
15.64-2.53-7.47;
3.7+6.3÷0.6-0.4;
3.5÷〔(0.45-0.38)×0.1〕;
5.6×7.2+4.4×7.2.
(1)15.64-2.53-7.47
=15.64-(2.53+7.47),
=15.64-10,
=5.64;
(2)3.7+6.3÷0.6-0.4
=3.7+10.5-0.4,
=13.8;
(3)3.5÷[(0.45-0.38)×0.1]
=3.5÷[0.07×0.1],
=3.5÷0.007,
=500;
(4)5.6×7.2+4.4×7.2
=(5.6+4.4)×7.2,
=10×7.2,
=72.
=15.64-(2.53+7.47),
=15.64-10,
=5.64;
(2)3.7+6.3÷0.6-0.4
=3.7+10.5-0.4,
=13.8;
(3)3.5÷[(0.45-0.38)×0.1]
=3.5÷[0.07×0.1],
=3.5÷0.007,
=500;
(4)5.6×7.2+4.4×7.2
=(5.6+4.4)×7.2,
=10×7.2,
=72.
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