(5.6-5.6÷7)x22.4简便计算？
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(5.6-5.6÷7)x22.4
=5.6×(1-1/7)×22.4
=5.6×6/7×7×3.2
=5.6×6×3.2
=33.6×3.2
=(33+0.6)×(3+0.2)
=33×3+33×0.2+3×0.6+0.2×0.6
=99+6.6+1.8+0.12
=107.52
=5.6×(1-1/7)×22.4
=5.6×6/7×7×3.2
=5.6×6×3.2
=33.6×3.2
=(33+0.6)×(3+0.2)
=33×3+33×0.2+3×0.6+0.2×0.6
=99+6.6+1.8+0.12
=107.52
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