4.2×9.9 +4.2×99+ 3.5简便算法怎么算?
3个回答
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4.2×9.9+4.2×99+3.5
=4.2×9.9+4.2×99
+4.2-0.7
=4.2(9.9+99+1)-0.7
=4.2(100+10-0.1)
-0.7
=4.2×(110-0.1)
-0.7
=462-0.42-0.7
=462-(0.42+0.7)
=462-1.12
=460+(2-1.12)
=460.88
=4.2×9.9+4.2×99
+4.2-0.7
=4.2(9.9+99+1)-0.7
=4.2(100+10-0.1)
-0.7
=4.2×(110-0.1)
-0.7
=462-0.42-0.7
=462-(0.42+0.7)
=462-1.12
=460+(2-1.12)
=460.88
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展开全部
4.2*9.9+4.2*99+3.5
=99*(0.42+4.2)+3.5
=99*4.62+3.5
=4.62*(100-1)+3.5
=462-4.62+3.5
=462-4.62+(4-0.5)
=462-4.62+4-0.5
=466-(4.62+0.5)
=466-5.12
=465+1-5-0.12
=460+0.88
=460.88
=99*(0.42+4.2)+3.5
=99*4.62+3.5
=4.62*(100-1)+3.5
=462-4.62+3.5
=462-4.62+(4-0.5)
=462-4.62+4-0.5
=466-(4.62+0.5)
=466-5.12
=465+1-5-0.12
=460+0.88
=460.88
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