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用递等式计算.(能简算的要写出简算过程)(1)8.5×[(2.36+2.42)÷0.25](2)3.9÷[(1.3+0.6)×6-3.6](3)4.25×6.3+3.7×4.25(4)205×0.99(5)25.6-7.49-2.51(6)[2.5-(6.8-4.9)]×0.8.
题目详情
用递等式计算.(能简算的要写出简算过程) (1)8.5×[(2.36+2.42)÷0.25] (2)3.9÷[(1.3+0.6)×6-3.6] (3)4.25×6.3+3.7×4.25 (4)205×0.99 (5)25.6-7.49-2.51 (6)[2.5-(6.8-4.9)]×0.8. |
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答案和解析
(1)8.5×[(2.36+2.42)÷0.25], =8.5×[4.78÷0.25], =8.5×19.12, =162.52; (2)3.9÷[(1.3+0.6)×6-3.6], =3.9÷[1.3×0.6+0.6×6-3.6], =3.9÷[0.78+3.6-3.6], =3.9÷0.78, =5; (3)4.25×6.3+3.7×4.25, =4.25×(6.3+3.7), =4.25×10, =42.5; (4)205×0.99, =205×(1-0.01), =205×1-205×0.01, =205-2.05, =202.95; (5)25.6-7.49-2.51, =25.6-(7.49+2.51), =25.6-10, =15.6; (6)[2.5-(6.8-4.9)]×0.8, =[2.5-1.9]×0.8, =0.6×0.8, =0.48. |
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