脱式计算,能简算的要简算. 1.69÷1.3+2.5×0.4 1.25×32×2.5 96.5×105-5×96.
来源:学生作业帮 编辑:百度作业网作业帮 分类:数学作业 时间:2024/05/16 10:03:25
脱式计算,能简算的要简算.
1.69÷1.3+2.5×0.4 | 1.25×32×2.5 | 96.5×105-5×96.5 | 18.75-0.43-4.57. |
(1)1.69÷1.3+2.5×0.4,
=1.3+1,
=2.3;
(2)1.25×32×2.5,
=1.25×(8×4)×2.5,
=(1.25×8)×(4×2.5),
=10×10,
=100;
(3)96.5×105-5×96.5,
=96.5×(105-5),
=96.5×100,
=9650;
(4)18.75-0.43-4.57,
=18.75-(0.43+4.57),
=18.75-5,
=13.75.
=1.3+1,
=2.3;
(2)1.25×32×2.5,
=1.25×(8×4)×2.5,
=(1.25×8)×(4×2.5),
=10×10,
=100;
(3)96.5×105-5×96.5,
=96.5×(105-5),
=96.5×100,
=9650;
(4)18.75-0.43-4.57,
=18.75-(0.43+4.57),
=18.75-5,
=13.75.