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(1)28-[19.08+(3.2-0.299÷0.23)]×0.5

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/13 19:16:28
(1)28-[19.08+(3.2-0.299÷0.23)]×0.5
(2)64×1.25×2.5×5
(3)34.5×9.23-34.5+1.77×34.5
(4)(67.8+9.48)÷0.96-2.58×3.35.
(1)28-[19.08+(3.2-0.299÷0.23)]×0.5,
=28-[19.08+(3.2-1.3)]×0.5,
=28-[19.08+1.9]×0.5,
=28-20.98×0.5,
=28-10.49,
=17.51;
(2)64×1.25×2.5×5,
=2×4×8×1.25×2.5×5,
=(8×1.25)×(2.5×4)×(5×2),
=10×10×10,
=1000;
(3)34.5×9.23-34.5+1.77×34.5,
=(9.23-1+1.77)×34.5,
=10×34.5,
=345;
(4)(67.8+9.48)÷0.96-2.58×3.35,
=77.28÷0.96-2.58×3.35,
=80.5-8.643,
=71.857.