来自黄钊洪的问题
运用运算定律或性质简算99×7.810.26-(3.78+4.26)
运用运算定律或性质简算
99×7.8
10.26-(3.78+4.26)
1回答
2020-05-06 21:17
运用运算定律或性质简算99×7.810.26-(3.78+4.26)
运用运算定律或性质简算
99×7.8
10.26-(3.78+4.26)
(1)99×7.8,
=(100-1)×7.8,
=100×7.8-1×7.8,
=780-7.8,
=772.2;
(2),
=(46)+(3+5),
=11+9,
=20;
(3)10.26-(3.78+4.26),
=10.26-4.26-3.78,
=6-3.78,
=2.22.