3.82÷0.2-0.2×2.5
=38.2÷2-0.5
=19.1-0.5
=18.6
2.4×1.58+6.6×1.58+1.58
=1.58x(2.4+6.6+1)
=1.58x10
=15.8
0.48×6.5+5.2×0.65
=4.8×0.65+5.2×0.65
=(4.8+5.2)×0.65
=10×0.65
=6.5
12.4-12.4×0.25
=12.4×(1-0.25)
=12.4×3/4
=3.1×3
=9.3
七分之五-（七分之五-二分之一）
=5/7-5/7+1/2
=1/2
0.125×9+1÷8
=9x1/8+1x1/8
=(9+1)x1/8
=5/4
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