killerjrob
春芽
共回答了20个问题采纳率:100% 举报
①42÷(5.25÷0.25)
=42÷(5.25×4)
=42÷21
=2
②0.4+12.6÷0.28×0.2
=0.4+45×0.2
=0.4+9
=9.4
③8.4-8.4×1.5÷1.8
=8.4×(1-
5
6 )
=8.4×
1
6
=1.4
④0.27×99+0.27
=0.27×(99+1)
=0.27×100
=27
⑤2.5×3.2×0.125
=2.5×(0.4×8)×0.125
=(2.5×0.4)×(8×0.125)
=1×1
=1
⑥13.5÷2.5÷0.125÷0.4÷8
=13.5÷(2.5×0.125×0.4×8)
=13.5÷[(2.5×0.4)×(0.125×8)]
=13.5÷[1×1]
=13.5÷1
=13.5.
1年前
9