题目内容
计算下列各题,注意计算顺序. 48+6×(5+6) |
42+7×14-60 | (72-64)×12÷6 |
75+360÷(20-5) | 180-3×(12+6) | 180÷4×(66-58) |
分析:(1)先算小括号里面的,再算乘法,最后算加法;
(2)先算乘法,再算加法,最后算减法;
(3)先算减法,再算乘法,最后算乘法;
(4)先算减法,再算除法,最后算加法;
(5)先算加法,再算乘法,最后算减法;
(6)先算减法,再算除法,最后算乘法.
(2)先算乘法,再算加法,最后算减法;
(3)先算减法,再算乘法,最后算乘法;
(4)先算减法,再算除法,最后算加法;
(5)先算加法,再算乘法,最后算减法;
(6)先算减法,再算除法,最后算乘法.
解答:解:(1)48+6×(5+6)
=48+6×11
=48+66
=114;
(2)42+7×14-60
=42+98-60
=140-60
=80;
(3)(72-64)×12÷6
=8×12÷6
=96÷6
=16;
(4)75+360÷(20-5)
=75+360÷15
=75+24
=99;
(5)180-3×(12+6)
=180-3×18
=180-54
=126;
(6)180÷4×(66-58)
=180÷4×8
=45×8
=360.
=48+6×11
=48+66
=114;
(2)42+7×14-60
=42+98-60
=140-60
=80;
(3)(72-64)×12÷6
=8×12÷6
=96÷6
=16;
(4)75+360÷(20-5)
=75+360÷15
=75+24
=99;
(5)180-3×(12+6)
=180-3×18
=180-54
=126;
(6)180÷4×(66-58)
=180÷4×8
=45×8
=360.
点评:整数混合运算的关键是抓住运算顺序,正确按运算顺序计算即可.
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