用简便方法计算,要过程
1个回答
展开全部
1.36+0.76+4.64
=1.36+4.64+0.76
=5+0.76
=5.76
2.24*99+2.24
=2.24(99+1)
=2.24*100
=224
1.69*999
=1.69(1000-1)
=1.69*1000-1.69
=1690-1.69
=1688.31
50*0.46*0.2
=50*0.2*0.46
=10*1.46
=4.6
(1.25-0.125)*8
=1.25*8-0.125*8
=10-1
=9
8.3+8.3*9
=8.3(1+9)
=83*10
=83
=1.36+4.64+0.76
=5+0.76
=5.76
2.24*99+2.24
=2.24(99+1)
=2.24*100
=224
1.69*999
=1.69(1000-1)
=1.69*1000-1.69
=1690-1.69
=1688.31
50*0.46*0.2
=50*0.2*0.46
=10*1.46
=4.6
(1.25-0.125)*8
=1.25*8-0.125*8
=10-1
=9
8.3+8.3*9
=8.3(1+9)
=83*10
=83
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