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用递等式计算.(能简算的要写出简算过程)(1)1.25×3.2×0.25(2)6.4×0.27+3.6×0.27(3)3.84-0.84×5÷1.5(4)2.5×0.99(5)8.19+0.5×(4.36-2.74)(6)1.8×2.48+1.52×1.8-0.5(7)[(6-
题目详情
用递等式计算.(能简算的要写出简算过程)
(1)1.25×3.2×0.25 | (2)6.4×0.27+3.6×0.27 |
(3)3.84-0.84×5÷1.5 | (4)2.5×0.99 |
(5)8.19+0.5×(4.36-2.74) | (6)1.8×2.48+1.52×1.8-0.5 |
(7)[(6-4.2)×2.5]÷2.5×1 | (8)4.02÷[(1-0.4)÷0.1]. |
▼优质解答
答案和解析
(1)1.25×3.2×0.25,
=1.25×8×0.4×0.25,
=(1.25×8)×(0.4×0.25),
=10×0.1,
=1;
(2)6.4×0.27+3.6×0.27,
=(6.4+3.6)×0.27,
=10×0.27,
=2.7;
(3)3.84-0.84×5÷1.5,
=3.84-4.2÷1.5,
=3.84-2.8,
=1.04;
(4)2.5×0.99,
=2.5×(1-0.01),
=2.5×1-2.5×0.01,
=2.5-0.025,
=2.475;
(5)8.19+0.5×(4.36-2.74),
=8.19+0.5×1.62,
=8.19+0.81,
=9;
(6)1.8×2.48+1.52×1.8-0.5,
=1.8×(2.48+1.52)-0.5,
=1.8×4-0.5,
=7.2-0.5,
=6.8;
(7)[(6-4.2)×2.5]÷2.5×1,
=[1.8×2.5]÷2.5×1,
=1.8×(2.5÷2.5)×1,
=1.8×1×1,
=1.8;
(8)4.02÷[(1-0.4)÷0.1],
=4.02÷[0.6÷0.1],
=4.02÷6,
=0.67.
=1.25×8×0.4×0.25,
=(1.25×8)×(0.4×0.25),
=10×0.1,
=1;
(2)6.4×0.27+3.6×0.27,
=(6.4+3.6)×0.27,
=10×0.27,
=2.7;
(3)3.84-0.84×5÷1.5,
=3.84-4.2÷1.5,
=3.84-2.8,
=1.04;
(4)2.5×0.99,
=2.5×(1-0.01),
=2.5×1-2.5×0.01,
=2.5-0.025,
=2.475;
(5)8.19+0.5×(4.36-2.74),
=8.19+0.5×1.62,
=8.19+0.81,
=9;
(6)1.8×2.48+1.52×1.8-0.5,
=1.8×(2.48+1.52)-0.5,
=1.8×4-0.5,
=7.2-0.5,
=6.8;
(7)[(6-4.2)×2.5]÷2.5×1,
=[1.8×2.5]÷2.5×1,
=1.8×(2.5÷2.5)×1,
=1.8×1×1,
=1.8;
(8)4.02÷[(1-0.4)÷0.1],
=4.02÷[0.6÷0.1],
=4.02÷6,
=0.67.
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