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4.2x7.8+2.2x42
=4.2x7.8+2.2x4.2×10
=4.2x7.8+4.2×22
=4.2×(7.8+22)
=4.2×29.8
=4.2×(30-0.2)
=4.2×30-4.2×0.2
=126-0.84
=125.16
=4.2x7.8+2.2x4.2×10
=4.2x7.8+4.2×22
=4.2×(7.8+22)
=4.2×29.8
=4.2×(30-0.2)
=4.2×30-4.2×0.2
=126-0.84
=125.16
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展开全部
4.2×7.8+2.2×42
=4.2×7.8+4.2×22
=4.2×(7.8+22)
=4.2×29.8
=4.2×(30-0.2)
=4.2×30-4.2×0.2
=126-0.74
=125.26
=4.2×7.8+4.2×22
=4.2×(7.8+22)
=4.2×29.8
=4.2×(30-0.2)
=4.2×30-4.2×0.2
=126-0.74
=125.26
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