题目内容
【题目】用简便方法计算
①146.5—(23+46.5) ②175×0.25×40
③7.61+7.61×99 ④300÷125÷0.8
【答案】77;1750;761;3
【解析】
①146.5-(23+46.5) ② 175 ×0.25×40
=146.5-46.5-23 =175×(0.25×40)
=100-23 =175×10
=77 =1750
③7.61+7.61×99 ④300÷125÷0.8
=7.61×(99+1) =300÷(125×0.8)
=7.61×100 =300÷100
=761 =3
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