问题
解答题
计算 (1)
(2)1
(3)
(4)7.8÷[32×(1-
|
答案
(1)
×8×13 5
×1.25,8 13
=(
×13 5
)×(8×1.25),8 13
=
×10,8 5
=16;
(2)1
×1.25+14 5
×2.2-11 4
,1 4
=1.8×1.25+1.25×2.2-1.25×1,
=(1.8+2.2-1)×1.25,
=3×1.25,
=3.75;
(3)
÷[(3 8
+1 5
)×1 4
],3 8
=
÷[3 8
×9 20
],3 8
=
×3 8
,160 27
=
;20 9
(4)7.8÷[32×(1-
)+3.6],5 8
=7.8÷[32×
+3.6],3 8
=7.8÷[12+3.6],
=7.8÷15.6,
=0.5.