4.9×0.9+51×0.01简便运算?
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4.9ⅹ0.9+51x0.01
=4.9ⅹ0.9+5.1x0.1
=(5一0.1)x(1一0.1)
+(5+0.1)x0.1
=5一0.1一0.5+0.1^2+0.5
+0.1^2
=4.9+0.02
=4.92。
=4.9ⅹ0.9+5.1x0.1
=(5一0.1)x(1一0.1)
+(5+0.1)x0.1
=5一0.1一0.5+0.1^2+0.5
+0.1^2
=4.9+0.02
=4.92。
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4.9×0.9+51×0.01
=4.9×0.9+5.1×0.1
=4.9×0.9+4.9×0.1+0.2×0.1
=4.9×(0.9+0.1)+0.02
=4.9+0.02
=4.92
=4.9×0.9+5.1×0.1
=4.9×0.9+4.9×0.1+0.2×0.1
=4.9×(0.9+0.1)+0.02
=4.9+0.02
=4.92
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展开全部
4.9ⅹ0.9+51x0.01
=4.9ⅹ0.9+5.1x0.1
=(5一0.1)x(1一0.1)
+(5+0.1)x0.1
=5一0.1一0.5+0.1^2+0.5
+0.1^2
=4.9+0.02
=4.92。
=4.9ⅹ0.9+5.1x0.1
=(5一0.1)x(1一0.1)
+(5+0.1)x0.1
=5一0.1一0.5+0.1^2+0.5
+0.1^2
=4.9+0.02
=4.92。
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已踩过<
评论
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