1樓:為愛痴狂
(1)26+37-50
=63-50
=13(2)2.5×1.4-8.5÷5
=3.5-1.7
=1.8
(3)(版34
-18)÷5
6=58÷5
8=1(4)1
15÷[(23+1
5)×權126
]=115÷[13
15×126]
=115
÷130=2
2樓:蘭莞戈海白
解答du:解:(1)26+37-50
=63-50
=13(2)2.5×
zhi1.4-8.5÷dao5
=3.5-1.7
=1.8
(3)(34
-18)÷
56=5
8÷58
=1(4)115
÷[(23+
15)×1
26]=1
15÷[
1315×1
26]=1
15÷130=2
用遞等式計算,能簡算的要簡算.(18%)(1)25×12-850÷17(2)(3.2÷16+10.8)÷22(3)3.2×12.5×2
3樓:匿名使用者
(du1)25×zhi12-850÷
dao17
=25×4×3-50,
=300-50,
=250;
(2)(3.2÷16+10.8)÷22
=(0.2+10.8)÷22,
=11÷22,
=0.5;
(3)3.2×12.5×2.5
=0.8×4×12.5×2.5,
=(12.5×0.8)×(2.5×4),
=10×10,
=100;
(4)7.05-3.84-0.16-1.05=7.05-1.05-(3.84+0.16),=6-4,
=2;(5)8
17×9-8÷17 8
=817
×9-8×8
17,=(9-8)×8
17,=1×8
17,=8
17;(6)5 6
×[2÷(7 8
-3 4
)]=5 6
×[2÷1 8
],=5 6
×16,
=40 3.
用遞等式計算.(能簡算的要寫出簡算過程) (1)8.5×[(2.36+2.42)÷0.25] (2)3.9÷[(1.3
4樓:句哀木專屬
(du1)8.5×
[(2.36+2.42)÷0.25],
=8.5×zhi[4.78÷dao0.25],=8.5×內19.12,
=162.52;
(容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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