1.2x2.5+28x0.25的简便计算
解：根据提取公因式的简便方法，
原式=1.2x2.5+2.8x2.5
=（1.2+2.8）x2.5
=4x2.5
=10
1.2x2.5+28x0.25
=1.2×2.5+2.8×2.5
=（1.2+2.8）×2.5
=4×2.5
=10
1.2*2.5+28*0.25=2.5*1.2+2.8*2.5=2.5*（1.2+2.8=）=2.5*4=10
1.2x2.5+28x0.25
=1.2x2.5+2.8x2.5
=（1.2+2.8）x2.5
=4x2.5
=10
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