3.计算+12.5×4+3.12+1.2+25.2-(7.8-2.6)×1.3
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12.5×4+3.12+1.2+25.2-(7.8-2.6)×1.3
=50+4.32+25.2-5.2×1.3
=54.32+25.2-5.2×1-5.2×0.3
=54.32+20+5.2-5.2-1.56
=74.32-1.56
=74.32-2+0.44
=72.76
=50+4.32+25.2-5.2×1.3
=54.32+25.2-5.2×1-5.2×0.3
=54.32+20+5.2-5.2-1.56
=74.32-1.56
=74.32-2+0.44
=72.76
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