问题
解答题
①32×0.25×1.25
②5.4+0.7+9.3+4.6
③2.4×2-0.65-0.55
④0.125×(80×8)
答案
①32×0.25×1.25,
=(4×0.25)×(8×1.25),
=1×10,
=10;
②5.4+0.7+9.3+4.6
=(5.4+4.6)+(0.7+9.3),
=10+10,
=20;
③2.4×2-0.65-0.55
=4.8-(0.65+0.55),
=4.8-1.2,
=3.6;
④0.125×(80×8),
=0.125×8×80,
=1×80,
=80.