计算:
(1)[14.8+(3-1.5)×1]÷4
(2)3.5÷1+6.5×[12×(-0.3)-0.15)].
网友回答
解:(1)[14.8+(3-1.5)×1]÷4,
=[14.8+1.875×1]÷4,
=[14.8+1.95]÷4,
=16.75÷4,
=;
(2)3.5÷1+6.5×[12×(-0.3)-0.15],
=3.5÷1+6.5×[12×-0.15],
=3.5÷1+6.5×[6.4-0.15],
=3.5÷1+6.5×6.25,
=+40.625,
=42.
解析分析:(1)先算减法,再算乘法,再算加法,最后算除法;
(2)先算小括号里面的减法,再算中括号里面的乘法,再算中括号里面的减法,再算括号外面的除法和乘法,最后算算加法.
点评:考查了运算定律与简便运算,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律简便计算.