帮我做一下下列数学题
2个回答
2015-10-29 · 知道合伙人教育行家
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(12.5×25)×8
=12.5×8×25
=100×25
=2500
7.5+2.5×(0.32÷4)
=7.5+2.5×0.08
=7.5+0.2
=7.7
6.4×0.99
=6.4×(1-0.01)
=6.4×1-6.4×0.01
=6.4-0.064
=6.336
4×(0.25+9.6)
=4×9.85
=4×(10-0.15)
=4×10-4×0.15
=40-0.6
=9.4
0.25÷5+20.5÷5
=0.05+4.1
=4.15
=12.5×8×25
=100×25
=2500
7.5+2.5×(0.32÷4)
=7.5+2.5×0.08
=7.5+0.2
=7.7
6.4×0.99
=6.4×(1-0.01)
=6.4×1-6.4×0.01
=6.4-0.064
=6.336
4×(0.25+9.6)
=4×9.85
=4×(10-0.15)
=4×10-4×0.15
=40-0.6
=9.4
0.25÷5+20.5÷5
=0.05+4.1
=4.15
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