原式=ab/2(a²+2ab+b²)
=ab/2(a+b)²
=1/2÷2×2²
=1
a³b/2+a²b²+ab³/2
=ab/2(a²+2ab+b²)
=ab/2(a+b)²
a+b=2
(a+b)²=2²=4
ab=1/2
ab/2=1/4
原式=ab/2(a+b)²
=1/4*4
=1
a³b/2＋a²b²＋ab³/2
＝ab/2(a²＋2ab＋b²)
＝ab/2(a＋b)²
＝1/2/2×2²
＝1/4×4
＝1
a³b/2+a²b²+ab³/2
=ab(a²/2+ab+b²/2)
=ab(a²+2ab+b²)/2
=ab(a+b)²/2
=1/2 * 2² /2
=1
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