要用递等式计算,要用简便运算? 10
2个回答
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32×2.5×1.25
=4×8×2.5×1.25
=(4×2.5)×(8×1.25)
=10×10
=100
1.08×0.8÷0.27
=1.08÷0.27×0.8
=4×0.8
=3.2
28.9÷1.25÷0.8
=28.9÷(1.25×0.8)
=28.9÷1
=28.9
4.32×7.3+2.7×4.32
=4.32×(7.3+2.7)
=4.32×10
=43.2
(5.2-4.6)×4.25-0.8
=0.6×4.25-0.8
=2.5-0.8
=1.7
7.5×99
=7.5×(100-1)
=7.5×100-7.5×1
=750-7.5
=742.5
=4×8×2.5×1.25
=(4×2.5)×(8×1.25)
=10×10
=100
1.08×0.8÷0.27
=1.08÷0.27×0.8
=4×0.8
=3.2
28.9÷1.25÷0.8
=28.9÷(1.25×0.8)
=28.9÷1
=28.9
4.32×7.3+2.7×4.32
=4.32×(7.3+2.7)
=4.32×10
=43.2
(5.2-4.6)×4.25-0.8
=0.6×4.25-0.8
=2.5-0.8
=1.7
7.5×99
=7.5×(100-1)
=7.5×100-7.5×1
=750-7.5
=742.5
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