问题
解答题
用你喜欢的方法计算. (1)1080-63.58-36.42 (2)7.05×37+64×7.05-7.05 (3)[(
(4)85×0.75+15×75% |
答案
(1)1080-63.58-36.42,
=1080-(63.58+36.42),
=1080-100,
=980;
(2)7.05×37+64×7.05-7.05,
=7.05×(37+64-1),
=7.05×100,
=705;
(3)[(
+18 9
)×1 3
-0.75]÷3 4
,1 12
=[(
+18 9
)×1 3
-3 4
]÷3 4
,1 12
=[(
+18 9
-1)×1 3
]÷3 4
,1 12
=
×11 9
÷3 4
,1 12
=
÷11 12
,1 12
=11;
(4)85×0.75+15×75%,
=85×0.75+15×0.75,
=(85+15)×0.75,
=100×0.75,
=75.