题目内容
怎样简便就怎样算. 10.8-10.8÷3.6×1.5 |
12.5×2.5×8 |
84.7×0.35+0.65×84.7 | 2.43×99+2.43. |
分析:(1)先算除法和乘法,再算减法;
(2)运用乘法交换律与结合律简算;
(3)(4)运用乘法分配律简算.
(2)运用乘法交换律与结合律简算;
(3)(4)运用乘法分配律简算.
解答:解:(1)10.8-10.8÷3.6×1.5,
=10.8-3×1.5,
=10.8-4.5,
=6.3;
(2)12.5×2.5×8,
=(12.5×8)×2.5,
=100×2.5,
=250;
(3)84.7×0.35+0.65×84.7,
=84.7×(0.35+0.65),
=84.7×1,
=84.7;
(4)2.43×99+2.43,
=2.43×(99+1),
=2.43×100,
=243.
=10.8-3×1.5,
=10.8-4.5,
=6.3;
(2)12.5×2.5×8,
=(12.5×8)×2.5,
=100×2.5,
=250;
(3)84.7×0.35+0.65×84.7,
=84.7×(0.35+0.65),
=84.7×1,
=84.7;
(4)2.43×99+2.43,
=2.43×(99+1),
=2.43×100,
=243.
点评:此题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定律进行简便计算.
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