题目内容
0.125×16 | 3.2×5.6-11.4 | 5.74×99+5.74 |
4.75+3.25×2.4+7.6 | 3.8×1.4+18.2÷0.7 | 4.8×0.25 |
4.7×10.2 | 7.63×99+7.63 | 9.4-1.2÷0.6+6.24 |
6.73+2.56+1.44+3.27 | 2.37×2.5×4 | 1.5×102 |
2400÷16÷0.5 | 2.8×3.2+3.2×7.2 | 3.76×0.25-0.49 |
0.25×4.78×4 | 0.65×201 | 1.2×2.5+0.8×2.5. |
分析:完成本题据数乘法、除法、加法及四则混合运算法则计算即可,在计算时要注意分析式中数据,采用合适的方法简算.
解答:解:(1)0.125×16
=0.125×8×2,
=1×2,
=2;
(2)3.2×5.6-11.4
=17.92-11.4,
=6.52;
(3)5.74×99+5.74
=(99+1)×5.74,
=100×5.74,
=574;
(4)4.75+3.25×2.4+7.6
=4.75+7.8+7.6,
=20.15;
(5)3.8×1.4+18.2÷0.7
=5.32+26,
=31.32;
(6)4.8×0.25
=4×0.25×1.2,
=1×1.2,
=1.2;
(7)4.7×10.2=47.94;
(8)7.63×99+7.63
=(99+1)×7.63,
=100×7.63,
=763;
(9)9.4-1.2÷0.6+6.24
=9.4-2+6.24,
=13.64;
(10)6.73+2.56+1.44+3.27
=(6.73+3.27)+(2.56+1.44),
=10+4,
=14;
(11)2.37×2.5×4
=2.37×(2.5×4),
=2.37×10,
=23.7;
(12)1.5×102
=1.5×100+1.5×2,
=150+3,
=153;
(13)2400÷16÷0.5
=2400÷8÷(2×0.5),
=300÷1,
=300;
(14)2.8×3.2+3.2×7.2
=(2.8+7.2)×3.2,
=10×3.2,
=32.
(15)3.76×0.25-0.49
=0.94-0.49,
=0.45;
(16)0.25×4.78×4
=(0.25×4)×4.78,
=1×4.78,
=4.78;
(17)0.65×201
=0.65×200+0.65,
=130+0.65,
=130.65;
(18)1.2×2.5+0.8×2.5
=(1.2+0.8)×0.25,
=2×0.25,
=0.5.
=0.125×8×2,
=1×2,
=2;
(2)3.2×5.6-11.4
=17.92-11.4,
=6.52;
(3)5.74×99+5.74
=(99+1)×5.74,
=100×5.74,
=574;
(4)4.75+3.25×2.4+7.6
=4.75+7.8+7.6,
=20.15;
(5)3.8×1.4+18.2÷0.7
=5.32+26,
=31.32;
(6)4.8×0.25
=4×0.25×1.2,
=1×1.2,
=1.2;
(7)4.7×10.2=47.94;
(8)7.63×99+7.63
=(99+1)×7.63,
=100×7.63,
=763;
(9)9.4-1.2÷0.6+6.24
=9.4-2+6.24,
=13.64;
(10)6.73+2.56+1.44+3.27
=(6.73+3.27)+(2.56+1.44),
=10+4,
=14;
(11)2.37×2.5×4
=2.37×(2.5×4),
=2.37×10,
=23.7;
(12)1.5×102
=1.5×100+1.5×2,
=150+3,
=153;
(13)2400÷16÷0.5
=2400÷8÷(2×0.5),
=300÷1,
=300;
(14)2.8×3.2+3.2×7.2
=(2.8+7.2)×3.2,
=10×3.2,
=32.
(15)3.76×0.25-0.49
=0.94-0.49,
=0.45;
(16)0.25×4.78×4
=(0.25×4)×4.78,
=1×4.78,
=4.78;
(17)0.65×201
=0.65×200+0.65,
=130+0.65,
=130.65;
(18)1.2×2.5+0.8×2.5
=(1.2+0.8)×0.25,
=2×0.25,
=0.5.
点评:完成算式(4)(5)时不要被式中数据所迷惑,错用运算定律.
练习册系列答案
相关题目