1、1.25×(8+10)
=1.25×8+1.25×10
=10+12.5
=22.5
2、1.24+0.78+8.76
=(1.24+8.76)+0.78
=10+0.78
=10.78
3、1/2-(4/5-1/2)
=1/2+1/2-4/5
=1-4/5
=1/5
4、4800÷25÷4
=4800÷(25x4)
=4800÷100
=4800÷100
=48
5、2/5-(3/8-3/5)
=2/5+3/5-3/8
=1-3/8
=5/8
6、3/4-(3/7-1/4)
=3/4+1/4-3/7
=1-3/7
=4/7
7、3.2x0.125x2.5
=0.125x8x(0.4x2.5)
=1x1
=1
8、0.4×125×25×0.8
=(0.4×25)×(125×0.8)
=10×100
=1000
9、1.25×(8+10)
=1.25×8+1.25×10
=10+12.5
=22.5
10、9123-(123+8.8)
=9123-123-8.8
=9000-8.8
=8991.2
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