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用简便方法计算.(1)4×0.8×2.5×12.5(2)(6.4×12.5×0.5)÷(1.6×2.5×0.2)(3)7.46×36+74.6×6.4.
题目详情
用简便方法计算.
(1)4×0.8×2.5×12.5
(2)(6.4×12.5×0.5)÷(1.6×2.5×0.2)
(3)7.46×36+74.6×6.4.
(1)4×0.8×2.5×12.5
(2)(6.4×12.5×0.5)÷(1.6×2.5×0.2)
(3)7.46×36+74.6×6.4.
▼优质解答
答案和解析
(1)4×0.8×2.5×12.5,
=(4×2.5)×(0.8×12.5),
=10×10,
=100;
(2)(6.4×12.5×0.5)÷(1.6×2.5×0.2),
=(0.8×8×12.5×0.5)÷(0.4×4×2.5×0.2),
=[(0.8×12.5)×(8×0.5)]÷[(0.4×2.5)×(4×0.2)],
=[10×4]÷[1×0.8],
=40÷0.8,
=50;
(3)7.46×36+74.6×6.4,
=7.46×36+7.46×64,
=7.46×(36+64),
=7.46×100,
=746.
=(4×2.5)×(0.8×12.5),
=10×10,
=100;
(2)(6.4×12.5×0.5)÷(1.6×2.5×0.2),
=(0.8×8×12.5×0.5)÷(0.4×4×2.5×0.2),
=[(0.8×12.5)×(8×0.5)]÷[(0.4×2.5)×(4×0.2)],
=[10×4]÷[1×0.8],
=40÷0.8,
=50;
(3)7.46×36+74.6×6.4,
=7.46×36+7.46×64,
=7.46×(36+64),
=7.46×100,
=746.
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