27.9×4-25.4×10-25.4×3的简便计算
=(28-0.1)x4-254-76.2
=28x4-0.1x4-330.2
=112-0.4-330.2
=111.6-330.2
=-218.6
27.9×4-25.4×10-25.4×3
=27.9x4-254-76.2
=30x4-2.1x4-(254+76.2)
=120-(330.2+8.4)
=-(338.6-120)
=-218.6
=((1x5x7x8x10)x(2x11)x(3x9)x(4x6))/(27x25x24x22) =2800/25 =112
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