问题
解答题
计算. 0.25×[(2.8+4.4)÷1.2]
|
答案
(1)0.25×[(2.8+4.4)÷1.2]
=0.25×[7.2÷1.2]
=0.25×6
=1.5;
(2)
×14 15
-1 4
÷42 15
=
×14 15
-1 4
×2 15 1 4
=(
-14 15
)×2 15 1 4
=
×12 15 1 4
=
;1 5
(3)
÷[(3 5
+7 9
)×1 3
]3 2
=
÷[3 5
×10 9
]3 2
=
×3 5 3 5
=
;9 25
(4)
×3 7
+1 3
÷34 7
=
×3 7
+1 3
×4 7 1 3
=(
+3 7
)×4 7 1 3
=
.1 3