问题
解答题
脱式计算,能简便计算的要简便计算. 2.5×(1.5+1.5+1.5+1.5) 0.125×32×25
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答案
(1)2.5×(1.5+1.5+1.5+1.5)
=2.5×(1.5×4)
=(2.5×4)×1.5
=10×15
=15;
(2)0.125×32×25
=0.125×8×4×25
=(0.125×8)×(4×25)
=1×100
=100;
(3)
÷7 9
+3 7
×2 9 7 3
=
×7 9
+7 3
×2 9 7 3
=(
+7 9
)×2 9 7 3
=1×7 3
=
.7 3