0.31x［（0.42+0.68）+0.02］
=0.31x［1.1+0.02］
=0.31x［1+0.1+0.02］
=0.31x1+0.31x0.1+0.31x0.02
=0.31+0.031+0.0062
=0.3472
0.31x［（0.42+0.68）+0.02］
=0.31x(1.1+0.02)
=0.31x1.12
=0.3x1.12+0.01x1.12
=0.336+0.0112
=0.3472
0.31x［（0.42+0.68）+0.02］
=0.31×【1.1+0.02】
=0.31×1.12
=0.3472
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