简便运算3.75x99+3.75 0.4x63x2.5 2x63.29+2x36.71 0.02x38.7x50 4.9x1.01
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3.75x99+3.75
=3.75×（99+1）
=3.75×100
=375
0.4x63x2.5
=0.4×2.5×63
=1×63
=63
2x63.29+2x36.71
=2×（63.29+36.71 ）
=2×100
=200
0.02x38.7x50
=0.02×50×38.7
=1×38.7
=38.7
4.9x1.01
=4.9×（1+0.01）
=4.9+0.049
=4.949
=3.75×（99+1）
=3.75×100
=375
0.4x63x2.5
=0.4×2.5×63
=1×63
=63
2x63.29+2x36.71
=2×（63.29+36.71 ）
=2×100
=200
0.02x38.7x50
=0.02×50×38.7
=1×38.7
=38.7
4.9x1.01
=4.9×（1+0.01）
=4.9+0.049
=4.949
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