题目内容

递等式计算(能简便的要简便计算)
9.6÷0.4×0.25
8.68-8.68÷0.56×0.5 29.7÷(5.85÷0.65)
1.25×3.2×0.8 14.5×102 4.7×4.7+4.7+4.7×4.3.
分析:9.6÷0.4×0.25,按运算顺序进行计算;
8.68-8.68÷0.56×0.5,先利用除法的性质把原式改为8.68-8.68×(0.5÷0.56),然后用乘法分配律的逆运算简算;
29.7÷(5.85÷0.65),此题按运算顺序计算,先算括号内的,再算括号外的;
1.25×3.2×0.8,用乘法交换律和乘法结合律简算;
14.5×102,把102看作(100+2),然后用乘法分配律简算;
4.7×4.7+4.7+4.7×4.3,把4.7看作4.7×1,用乘法分配律简算.
解答:解:9.6÷0.4×0.25,
=24×0.25,
=0.25×4×6,
=6;

8.68-8.68÷0.56×0.5,
=8.68-8.68×(0.5÷0.56),
=8.68×(1-0.5÷0.56),
=8.68×0.06÷0.56,
=8.68×
3
28

=0.93;

29.7÷(5.85÷0.65),
=29.7÷9,
=3.3;

1.25×3.2×0.8,
=(1.25×0.8)×3.2,
=1×3.2,
=3.2;

14.5×102,
=14.5×(100+2),
=14.5×100+14.5×2,
=1450+29,
=1479;

4.7×4.7+4.7+4.7×4.3,
=(4.7+1+4.3)×4.7,
=10×4.7,
=47.
点评:此题考查学生小数四则混合运算的顺序,以及灵活运用运算定律简算的能力.
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