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用简便方法计算.17.2-1.58-4.424.77+7.46+1.23+2.5416.35-(4.71+6.35)9.

来源:学生作业帮 编辑:大师作文网作业帮 分类:综合作业 时间:2024/11/17 20:20:23
用简便方法计算.
17.2-1.58-4.42
4.77+7.46+1.23+2.54
16.35-(4.71+6.35)
9.38-6.8+6.62-3.2.
用简便方法计算.17.2-1.58-4.424.77+7.46+1.23+2.5416.35-(4.71+6.35)9.
①17.2-1.58-4.42
=17.2-(1.58+4.42)
=17.2-6
=11.2

②4.77+7.46+1.23+2.54
=(4.77+1.23)+(7.46+2.54)
=6+10
=16

③16.35-(4.71+6.35)
=16.35-4.71-6.35
=(16.35-6.35)-4.71
=10-4.71
=5.29

④9.38-6.8+6.62-3.2
=(9.38+6.62)-(6.8+3.2)
=16-10
=6