题目内容
2.9×1.4+2.9×1.6
30.8÷[14-(9.85+1.07)].
解:(1)2.9×1.4+2.9×1.6,
=2.9×(1.4+1.6),
=2.9×3,
=8.7;
(2)30.8÷[14-(9.85+1.07)],
=30.8÷[14-10.92],
=30.8÷3.08,
=10.
分析:(1)根据乘法分配律进行计算;
(2)先算加法,再算减法,最后算除法.
点评:四则运算,先弄清运算顺序,然后再进一步计算,能简算的要简算.
=2.9×(1.4+1.6),
=2.9×3,
=8.7;
(2)30.8÷[14-(9.85+1.07)],
=30.8÷[14-10.92],
=30.8÷3.08,
=10.
分析:(1)根据乘法分配律进行计算;
(2)先算加法,再算减法,最后算除法.
点评:四则运算,先弄清运算顺序,然后再进一步计算,能简算的要简算.
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