简便计算题 如下 好的 50 分·~

89+124+11+26+48
=89+11+124+26+48
=100+250+48
=398
975-147-23
=975-(147+23)
=975-170
=805
125x64
=125x8x8
=1000x8
=8000
134x8+8x66
=8x(134+66)
=8x200
=1600
365x99
=365x(100-1)
=365x100-365
=36500-365
=36135
3000÷125÷8
=3000÷(125x8)
=3000÷1000
=3