9999×7+1111×37
=1111×9×7+1111×37
=1111×63+1111×37
=1111×(63+37)
=1111×100
=111100
48×1.08+1.2×56.8
=12×4×1.08+12×5.68
=12×4.32+12×5.68
=12×(4.32+5.68)
=12×10
=120
18×7/5-5×7/4
=7×18/5-7×5/4
=7×(18/5-5/4)
=7×47/20
=329/20
2.5×2.85+0.25÷2/23
=2.5×2.85+0.25×11.5
=2.5×2.85+2.5×1.15
=2.5×(2.85+1.15)
=2.5×4
=10