2.05÷(1.5+0.55)×99%(
×
﹣
)÷
87.5%×
+12.5%×
×(
+
)÷
.
看谁算得准.
(1)7.2×99+7.2(2)5﹣(
÷
+
÷
)(3)(
+
)×7+
(4)0.125×2.5×3.2(5)1.05×(3.8﹣0.8)÷6.3(6)
÷[(
﹣
)×
].
计算下面各题,能用简便方法算的要用简便方法算.
①7.28﹣(1.25+0.28)
②9990×200.8+1×2008
③57×
+27×
④0.8×4×12.5×2.5
⑤
÷[(
+
)×
].
递等式计算(能简便的要简便)
①(
+
)÷
②2.5×13×0.42③5.3×12﹣33.46÷0.35
④
÷[(
+
)×
]⑤9.34﹣(2.34+0.49)⑥
+
×19.
计算,能简算的要简算.
805×101﹣805(1﹣
+
)×241.25×2.5×32
[7÷(
﹣
)]×
45×102
÷(3﹣
﹣
)