问题
解答题
计算下列各题. ①36×202-72 ②608×99+608 ③75×60%+24×
④[4
⑤14.85-1.58×8+31.2÷1.2. |
答案
①36×202-72,
=36×202-36×2,
=(202-2)×36,
=200×36,
=7200;
②608×99+608,
=608×(99+1),
=608×100,
=60800;
③75×60%+24×
+0.6,3 5
=75×0.6+24×0.6+0.6,
=(75+24+1)×0.6,
=100×0.6,
=60;
④[4
+(2.2-11 3
)×7 15
]÷4.5,5 22
=[4
+(21 3
-11 5
)×7 15
]÷45 22
,1 2
=[4
+1 3
×11 15
]÷45 22
,1 2
=[4
+1 3
]×1 6
,2 9
=
×27 6
,2 9
=1;
⑤14.85-1.58×8+31.2÷1.2,
=14.85-12.64+26,
=2.21+26,
=28.21.