问题
解答题
用递等式计算,能简便的要简便计算.
|
答案
(1)30-40.2÷2,
=30-20.1,
=9.9;
(2)3.8×3.5+6.2×3.5,
=(3.8+6.2)×3.5,
=10×3.5,
=35;
(3)1.25×7.9×0.8,
=1.25×0.8×7.9,
=1×7.9,
=7.9;
(4)4.5×3.8÷0.9,
=4.5÷0.9×3.8,
=5×3.8,
=19.
用递等式计算,能简便的要简便计算.
|
(1)30-40.2÷2,
=30-20.1,
=9.9;
(2)3.8×3.5+6.2×3.5,
=(3.8+6.2)×3.5,
=10×3.5,
=35;
(3)1.25×7.9×0.8,
=1.25×0.8×7.9,
=1×7.9,
=7.9;
(4)4.5×3.8÷0.9,
=4.5÷0.9×3.8,
=5×3.8,
=19.