题目内容
怎样简便怎样算.
63×10.1 | 4×0.125×8×0.25 | 93÷0.31÷3 |
16÷0.9×1.8 | 3.5×5.2+0.35×48 | 80.8×10.1÷808. |
分析:(1)把10.1看作10+0.1,运用乘法分配律简算;
(2)运用乘法交运用除法的性质简算换律与结合律简算;
(3)运用除法的性质简算;
(4)调整运算顺序,再运用除法的性质简算;
(5)原式变为3.5×5.2+3.5×4.8,运用乘法分配律简算;
(6)调整运算顺序,先算除法,再算乘法.
(2)运用乘法交运用除法的性质简算换律与结合律简算;
(3)运用除法的性质简算;
(4)调整运算顺序,再运用除法的性质简算;
(5)原式变为3.5×5.2+3.5×4.8,运用乘法分配律简算;
(6)调整运算顺序,先算除法,再算乘法.
解答:解:(1)63×10.1,
=63×(10+0.1),
=63×10+63×0.1,
=630+6.3,
=636.3;
(2)4×0.125×8×0.25,
=4×0.25×(0.125×8),
=1×1,
=1;
(3)93÷0.31÷3,
=93÷(0.31×3),
=93÷0.93,
=100;
(4)16÷0.9×1.8,
=16×(1.8÷0.9),
=16×2,
=32;
(5)3.5×5.2+0.35×48,
=3.5×5.2+3.5×4.8,
=3.5×(5.2+4.8),
=3.5×10,
=35;
(6)80.8×10.1÷808,
=80.8÷808×10.1,
=0.1×10.1,
=1.01.
=63×(10+0.1),
=63×10+63×0.1,
=630+6.3,
=636.3;
(2)4×0.125×8×0.25,
=4×0.25×(0.125×8),
=1×1,
=1;
(3)93÷0.31÷3,
=93÷(0.31×3),
=93÷0.93,
=100;
(4)16÷0.9×1.8,
=16×(1.8÷0.9),
=16×2,
=32;
(5)3.5×5.2+0.35×48,
=3.5×5.2+3.5×4.8,
=3.5×(5.2+4.8),
=3.5×10,
=35;
(6)80.8×10.1÷808,
=80.8÷808×10.1,
=0.1×10.1,
=1.01.
点评:根据数字特点,运用运算定律或运算技巧,灵活简算
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