(7.6×2.8+5.6×1.9-2.8×1.4)÷2.5×4 简便计算 我秒采纳..
2个回答
展开全部
原式
=(7.6x2.8+1.4x4x1.9-2.8x1.4)÷2.5x4
=(7.6x2.8+1.4x7.6-2.8x1.4)÷2.5x4
=[7.6x(2.8+1.4)-2.8x1.4]÷2.5x4
=(7.6x4.2-2.8x1.4)÷2.5x4
=(7.6x3x1.4-2.8x1.4)÷2.5x4
=(22.8x1.4-2.8x1.4)÷2.5x4
=20x1.4÷2.5x4
=20÷2.5x1.4x4
=8x1.4x4
=11.2x4
=44.8
供参考。
=(7.6x2.8+1.4x4x1.9-2.8x1.4)÷2.5x4
=(7.6x2.8+1.4x7.6-2.8x1.4)÷2.5x4
=[7.6x(2.8+1.4)-2.8x1.4]÷2.5x4
=(7.6x4.2-2.8x1.4)÷2.5x4
=(7.6x3x1.4-2.8x1.4)÷2.5x4
=(22.8x1.4-2.8x1.4)÷2.5x4
=20x1.4÷2.5x4
=20÷2.5x1.4x4
=8x1.4x4
=11.2x4
=44.8
供参考。
追问
写太长了吧
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