题目内容
脱式计算:
360+25×4
(38+82)÷4
33+27×3
850-250×3.
360+25×4
(38+82)÷4
33+27×3
850-250×3.
分析:(1)(3)先算乘法,再算加法;
(2)先算括号内的,再算括号外的;
(4)先算乘法,再算减法.
(2)先算括号内的,再算括号外的;
(4)先算乘法,再算减法.
解答:解:(1)360+25×4
=360+100
=460;
(2)(38+82)÷4
=120÷4
=30;
(3)33+27×3
=33+87
=120;
(4)850-250×3
=850-750
=100.
=360+100
=460;
(2)(38+82)÷4
=120÷4
=30;
(3)33+27×3
=33+87
=120;
(4)850-250×3
=850-750
=100.
点评:此题主要考查整数的四则混合运算的运算顺序和运算法则.
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