要简便就简便，求答案，
3个回答
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1.2x2.6+0.8x2.6
=(1.2+0.8)x2.6
=2x2.6
=5.2
0.25x0.458x4
=0.25x4x0.458
=1x0.458
=0.458
31.5x101-31.5
=31.5x(101-1)
=31.5x100
=3150
(0.8+0.08)x12.5
=0.8x12.5+0.08x12.5
=10+1
=11
=(1.2+0.8)x2.6
=2x2.6
=5.2
0.25x0.458x4
=0.25x4x0.458
=1x0.458
=0.458
31.5x101-31.5
=31.5x(101-1)
=31.5x100
=3150
(0.8+0.08)x12.5
=0.8x12.5+0.08x12.5
=10+1
=11
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