8.7x3.6+13x0.36 5.8x3.65 9.7x（5.83-2.64） 最简便算法 脱式计算 求帮忙 急！

8.7x3.6+13x0.36
=8.7x3.6+1.3x3.6
=（8.7+1.3）x3.6
=10x3.6
=36

5.8x3.65
=2.9×7.3
=（3-0.1）×7.3
=3×7.3-0.1×7.3
=21.9-0.73
=21.17

9.7x（5.83-2.64）
=9.7x3.19
=（10-0.3）×3.19
=10×3.19-0.3×3.19
=31.9-0.957
=30.943

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