题目内容
计算下面各题,注意使用简便算法.
①0.36+9.6÷3.2 | ②3.2×5.7+6.8×5.7 |
③25×6.8×0.04 | ④3.75÷〔0.3×(1.34-0.84)〕 |
分析:①先算除法,再算加法;
②运用乘法分配律简算;
③运用乘法交换律简算;
④先算小括号里面的减法,再算中括号里面的乘法,最后算括号外的除法.
②运用乘法分配律简算;
③运用乘法交换律简算;
④先算小括号里面的减法,再算中括号里面的乘法,最后算括号外的除法.
解答:解:①0.36+9.6÷3.2,
=0.36+3,
=3.36;
②3.2×5.7+6.8×5.7,
=(3.2+6.8)×5.7,
=10×5.7,
=57;
③25×6.8×0.04,
=25×0.04×6.8,
=1×6.8,
=6.8;
④3.75÷[0.3×(1.34-0.84)],
=3.75÷[0.3×0.5],
=3.75÷0.15,
=25.
=0.36+3,
=3.36;
②3.2×5.7+6.8×5.7,
=(3.2+6.8)×5.7,
=10×5.7,
=57;
③25×6.8×0.04,
=25×0.04×6.8,
=1×6.8,
=6.8;
④3.75÷[0.3×(1.34-0.84)],
=3.75÷[0.3×0.5],
=3.75÷0.15,
=25.
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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