问题
解答题
下面各题怎样简便就怎样算. 6.3×8.7+8.7×3.7 (
3÷
|
答案
(1)6.3×8.7+8.7×3.7
=(6.3+3.7)×8.7
=10×8.7
=87
(2)(
-1 3
+1 6
)×121 4
=
×12-1 3
×12+1 6
×121 4
=4-2+3
=5
(3)
×7 4
+5 8
÷1 4 8 5
=
×7 4
+5 8
×1 4 5 8
=(
+7 4
)×1 4 5 8
=2×5 8
=5 4
(4)3÷
-3 7
÷33 7
=3×
-7 3
×3 7 1 3
=7-1 7
=66 7
(5)
÷[9 20
×(1 2
+2 3
)]4 5
=
÷[9 20
×1 2
]22 15
=
÷9 20 11 15
=
×9 20 15 11
=
.27 44