问题
解答题
计算下列各题,能简算的要简算. ①5.25×3.6+5.25×3.4+5.25 ②(0.75+0.2)÷0.25×250% ③
④13×(
|
答案
①5.25×3.6+5.25×3.4+5.25,
=5.25+(3.6+3.4+1),
=5.25×8,
=42;
②(0.75+0.2)÷0.25×250%,
=0.95÷0.25×2.5,
=3.8×2.5,
=9.5;
③
÷[(1 8
-5 8
)×1 3
],3 7
=
÷[1 8
×7 24
],3 7
=
÷1 8
,1 8
=1;
④13×(
+3 29
)×29,1 13
=(13×29)×(
+3 29
),1 13
=(29×
×13)+(13×3 29
×29),1 13
=(3×13)+(1×29),
=39+29,
=68.