原式应该是:
89.3×43+38×89.3+893×1.9
=89.3x43+38x89.3+89.3x19
=89.3x(43+38+19)
=89.3x(81+19)
=89.3x100
=8930
供参考。
89.3×43+38×89.3+893×1点九简便运算的算
89.3×43+38×89.3+893×1.9
89.3*(43+38+19)
=89.3*100
=8930
分解:(89.3-50)×43+89.3×38+89.3×10×1.9
合并:89.3×(43+38+19)-43×50=
89.3×100-21.5×100=
(89.3-21.5)×100=
67.8×100=6780