题目内容
用你喜欢的方法计算.
10.64+7.65×2.4+11.76; 10.5÷(5.2-3.2); 15.52-4.3-5.7; (6.1-4.6)÷0.8-1.
10.64+7.65×2.4+11.76; 10.5÷(5.2-3.2); 15.52-4.3-5.7; (6.1-4.6)÷0.8-1.
分析:(1)先算乘法,然后从左往右依次运算;
(2)先算括号内的,再算括号外的;
(3)运用减法的性质简算;
(4)先算括号内的,再算括号外的除法,最后算减法.
(2)先算括号内的,再算括号外的;
(3)运用减法的性质简算;
(4)先算括号内的,再算括号外的除法,最后算减法.
解答:解:(1)10.64+7.65×2.4+11.76
=10.64+18.36+11.76
=29+11.76
=40.76;
(2)10.5÷(5.2-3.2)
=10.5÷2
=5.25;
(3)15.52-4.3-5.7
=15.52-(4.3+5.7)
=15.52-10
=5.52;
(4)(6.1-4.6)÷0.8-1
=1.5÷0.8-1
=1.875-1
=0.875.
=10.64+18.36+11.76
=29+11.76
=40.76;
(2)10.5÷(5.2-3.2)
=10.5÷2
=5.25;
(3)15.52-4.3-5.7
=15.52-(4.3+5.7)
=15.52-10
=5.52;
(4)(6.1-4.6)÷0.8-1
=1.5÷0.8-1
=1.875-1
=0.875.
点评:考查了小数的四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算性质简便计算.
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