脱式计算,能简算的要简算. 11/18×9/10+11/18÷10 3-5/9×7/20-11/36 9.9×17.6 8.6-(5.6+4.8)÷1.3 4/9÷[1−(2/5+1/10)×4/3].
问题描述:
脱式计算,能简算的要简算.
×11 18
+9 10
÷1011 18
3-
×5 9
-7 20
11 36
9.9×17.6
8.6-(5.6+4.8)÷1.3
÷[1−(4 9
+2 5
)×1 10
]. 4 3
答
(1)
×11 18
+9 10
÷1011 18
=
×(11 18
+9 10
)1 10
=
×111 18
=
11 18
(2)3-
×5 9
-7 20
11 36
=3-
-7 36
11 36
=3-(
+7 36
)11 36
=3−
1 2
=2
1 2
(3)9.9×17.6
=(10-0.1)×17.6
=10×17.6-1.76
=174.24
(4)8.6-(5.6+4.8)÷1.3
=8.6-10.4÷1.3
=8.6-8
=0.6
(5)
÷[1−(4 9
+2 5
)×1 10
]4 3
=
÷[1-4 9
×1 2
]4 3
=
÷4 9
1 3
=
4 3