问题
解答题
用递等式计算,能简算的要简算 7.28-(1.284+0.25) 8×4×12.5×2.5
2618-(486÷18×35) (
|
答案
(1)7.28-(1.284+0.25)
=7.28-(1.284+0.25)
=7.28-1.534
=5.746;
(2)8×4×12.5×2.5
=(8×12.5)×(4×2.5)
=100×10
=1000;
(3)
×9+3 7
×123 7
=
×(9+12)3 7
=
×213 7
=9;
(4)2618-(486÷18×35)
=2618-(27×35)
=2618-945
=1673;
(5)(
-5 6
)×24-3 4 3 5
=24×
-5 6
×24-3 4 3 5
=20-18-3 5
=2-3 5
=1
;2 5
(6)
÷[(3 5
+0.2)×2 3
]2 13
=
÷[(3 5
+2 3
)×1 5
]2 13
=
÷[3 5
×13 15
]2 13
=
÷3 5 2 15
=
×3 5 15 2
=
.9 2