题目内容
脱式计算 36×72+36×128 |
378+22×25-810 |
(366-350)×324÷4 | 109+(610-150×3) |
分析:(1)运用乘法分配律简算;
(2)先算乘法,再算减法,最后算减法;
(3)先算小括号里面的减法,再算括号外的乘法,最后算除法;
(4)先算小括号里面的乘法,再算小括号里面的减法,最后算括号外的加法.
(2)先算乘法,再算减法,最后算减法;
(3)先算小括号里面的减法,再算括号外的乘法,最后算除法;
(4)先算小括号里面的乘法,再算小括号里面的减法,最后算括号外的加法.
解答:解:(1)36×72+36×128
=36×(72+128)
=36×200
=7200;
(2)378+22×25-810
=378+550-810
=928-810
=118;
(3)(366-350)×324÷4
=16×324÷4
=5184÷4
=1296;
(4)109+(610-150×3)
=109+(610-450)
=109+160
=269.
=36×(72+128)
=36×200
=7200;
(2)378+22×25-810
=378+550-810
=928-810
=118;
(3)(366-350)×324÷4
=16×324÷4
=5184÷4
=1296;
(4)109+(610-150×3)
=109+(610-450)
=109+160
=269.
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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