4.77+7.46+1.23+2.54的简便运算
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)9.38-6.8+6.62-3.2....
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. 展开
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. 展开
1个回答
展开全部
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
=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
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