9.8ⅹ1.2-4.9简便方法
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9.8×1.2-4.9
=9.8×1.2-9.8×0.5
=9.8×(1.2-0.5)
=9.8×0.7
=6.86
=9.8×1.2-9.8×0.5
=9.8×(1.2-0.5)
=9.8×0.7
=6.86
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9.8×1.2-4.9
=4.9×2×1.2-4.9
=4.9×2.4-4.9
=4.9×(2.4-1)
=4.9×1.4
=(5-0.1)×1.4
=5×1.4-0.1×1.4
=5×(1+0.4)-0.14
=5×1+5×0.4-0.14
=5+2-0.14
=7-0.14
=6.86
=4.9×2×1.2-4.9
=4.9×2.4-4.9
=4.9×(2.4-1)
=4.9×1.4
=(5-0.1)×1.4
=5×1.4-0.1×1.4
=5×(1+0.4)-0.14
=5×1+5×0.4-0.14
=5+2-0.14
=7-0.14
=6.86
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=4.9x2x1.2-4.9x1
=4.9x2.4-4.9x1
=4.9x(2.4-1)
=4.9x1.4
=6.86
=4.9x2.4-4.9x1
=4.9x(2.4-1)
=4.9x1.4
=6.86
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