问题
解答题
计算下面各题,能简算的要简算 17.8-8.75+2.2-1.25 0.125×32×2.5
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答案
①17.8-8.75+2.2-1.25,
=(17.8+2.2)-(8.75+1.25),
=20-10,
=10;
②0.125×32×2.5,
=(0.125×8)×(4×2.5),
=1×10,
=10;
③
+4 7
+7 8
+3 7
,1 8
=(
+4 7
)+(3 7
+7 8
),1 8
=1+1,
=2;
④
+( 4 7
-17 24
),4 7
=
-4 7
+4 7
,17 24
=
.17 24