计算,能简算的要用简便方法计算.?
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解题思路:(1)先算乘法,再算减法;
(2)先算乘法,再算加法,最后算减法;
(3)根据除法的性质进行简算;
(4)根据乘法分配律进行简算.
(1)7.4-0.15×2.8
=7.4-0.42
=6.98;
(2)0.008+0.92×5-1.28
=0.008+4.6-1.28
=4.608-1.28
=3.328;
(3)7.8÷(1.3×4)
=7.8÷1.3÷4
=6÷4
=1.5;
(4)7.2×0.9+0.01×72
=7.2×0.9+0.1×7.2
=7.2×(0.9+0.1)
=7.2.
,1,计算,能简算的要用简便方法计算.
7.4-0.15×2.8 0.008+0.92×5-1.28 7.8÷(1.3×4) 7.2×0.9+0.01×72.
(2)先算乘法,再算加法,最后算减法;
(3)根据除法的性质进行简算;
(4)根据乘法分配律进行简算.
(1)7.4-0.15×2.8
=7.4-0.42
=6.98;
(2)0.008+0.92×5-1.28
=0.008+4.6-1.28
=4.608-1.28
=3.328;
(3)7.8÷(1.3×4)
=7.8÷1.3÷4
=6÷4
=1.5;
(4)7.2×0.9+0.01×72
=7.2×0.9+0.1×7.2
=7.2×(0.9+0.1)
=7.2.
,1,计算,能简算的要用简便方法计算.
7.4-0.15×2.8 0.008+0.92×5-1.28 7.8÷(1.3×4) 7.2×0.9+0.01×72.
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