作业帮4.8×0.25的简便算法
来源：学生作业帮助网 编辑：作业帮 时间：2024/04/30 09:26:25
4.8×0.25的简便算法
4.8×0.25的简便算法
4.8×0.25的简便算法
=1.2×4×0.25
=1.2×1
=1.2
即a<=x²<=b
a+b>0
所以显然b>0
所以
若a<0
则0<=x²<=b
-√b<=x<=√b
若a>=0
则a<=x²<=b
-√b<=x<=-√a,√a<=x<=√b
=1.2×4×0.25
=1.2×1
=1.2
4.8x0.25
=1.2×4×0.25
=1.2×1
=1.2
4.8x0.25
=(4+0.8)x0.25
=4x0.25+0.8x0.25
=1+0.2
=1.2
4.8x0.25
=1.2×4×0.25
=1.2×1
=1.2
4.8x0.25
=(4+0.8)x0.25
=4x0.25+0.8x0.25
=1+0.2
=1.2
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