[2.25+(335÷1.8-1.21×511)]÷40%
问题描述:
[2.25+(3
÷1.8-1.21×3 5
)]÷40% 5 11
答
[2.25+(3
÷1.8-1.21×3 5
)]÷40%,5 11
=[2.25+(
÷18 5
-0.55)]÷40%,9 5
=[2.25+(
×18 5
-0.55)]÷40%,5 9
=[2.25+(2-0.55)]÷40%,
=[2.25+(2-0.55)]÷40%,
=3.7÷0.4,
=9.25.
答案解析:先算小括号内的除法和乘法,再算小括号内的减法,然后算中括号内的加法,最后算括号外的除法.
考试点:整数、分数、小数、百分数四则混合运算.
知识点:考查了小数、分数的四则混合运算,注意运算顺序和运算法则.