4.2*2.22+2.2*1.11+5.55*7.8的简便计算?
2个回答
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原式=4.2×2×1.11 + 2.2×1.11 + 5×1.11×7.8
=1.11×(4.2×2 + 2.2 + 5×7.8)
=1.11×(8.4 + 2.2 + 39)
=1.11×49.6
=1.11×(50-0.4)
=1.11×50-1.11×0.4
=55.5-0.444
=55.056
=1.11×(4.2×2 + 2.2 + 5×7.8)
=1.11×(8.4 + 2.2 + 39)
=1.11×49.6
=1.11×(50-0.4)
=1.11×50-1.11×0.4
=55.5-0.444
=55.056
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