这些简便运算怎么写?
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8.1÷(0.9×0.3)
=8.1÷0.9÷0.3
=9÷0.3
=30
14.25-4.72+5.75-5.28
=(174.25+5.75)-(4.72+5.28)
=20-10
=10
0.32×0.25×12.5
=(0.4×0.25)×(0.8×12.5)
=0.1×10
=1
4.25÷2.5×101-1.7
=1.7×101-1.7
=1.7×(101-1)
=1.7×100
=170
0.54×32+5.4×6.8
=0.54×32+0.54×68
=0.54×(32+68)
=0.54×100
=54
6.4×4+3.6÷0.25
=6.4×4+3.6×4
=(6.4+3.6)×4
=10×4
=40
=8.1÷0.9÷0.3
=9÷0.3
=30
14.25-4.72+5.75-5.28
=(174.25+5.75)-(4.72+5.28)
=20-10
=10
0.32×0.25×12.5
=(0.4×0.25)×(0.8×12.5)
=0.1×10
=1
4.25÷2.5×101-1.7
=1.7×101-1.7
=1.7×(101-1)
=1.7×100
=170
0.54×32+5.4×6.8
=0.54×32+0.54×68
=0.54×(32+68)
=0.54×100
=54
6.4×4+3.6÷0.25
=6.4×4+3.6×4
=(6.4+3.6)×4
=10×4
=40
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