数学题,求解,第三题
3个回答
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3.6×99
=3.6×(100-1)
=3.6×100-3.6×1
=360-3.6
=356.4
(2.5+0.125)×8
=2.5×8+0.125×8
=20+1
=21
4.7×99+4.7
=4.7×(99+1)
=4.7×100
=470
53×10.2
=53×(10+0.2)
=53×10+53×0.2
=530+10.6
=540.6
=3.6×(100-1)
=3.6×100-3.6×1
=360-3.6
=356.4
(2.5+0.125)×8
=2.5×8+0.125×8
=20+1
=21
4.7×99+4.7
=4.7×(99+1)
=4.7×100
=470
53×10.2
=53×(10+0.2)
=53×10+53×0.2
=530+10.6
=540.6
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(12.5x43)
追答
(12.5x43)x3
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