如题所述
第1个回答 2019-07-03
4x102一2X49
=408-98
=310
25x(2+4)
=25×6
=150
12x5+8
=60+8
=68
99X101
=99×(100+1)
=99×100+99×1
=9900+99
=9999
55+60+40+45
=(55+45)+(60+40)
=100+100
=200本回答被网友采纳
=408-98
=310
25x(2+4)
=25×6
=150
12x5+8
=60+8
=68
99X101
=99×(100+1)
=99×100+99×1
=9900+99
=9999
55+60+40+45
=(55+45)+(60+40)
=100+100
=200本回答被网友采纳
第2个回答 2019-07-03
4×102-2×49
=408-98
=310
25×(2+4)
=25×6
=150
12×5+8
=60+8
=68
99×101
=99×100+99×1
=9900+99
=9999
55+60+40+45
=(55+45)+(60+40)
=100+100
=200
=408-98
=310
25×(2+4)
=25×6
=150
12×5+8
=60+8
=68
99×101
=99×100+99×1
=9900+99
=9999
55+60+40+45
=(55+45)+(60+40)
=100+100
=200
第3个回答 2019-07-03
4×102-2×49
=408-98
=318
25×(2+4)
=25×2+25×4
=50+100
=150
12×5+8
=60+8
=68
99×101
=99×(100+1)
=99×100+99×1
=9900+99
=9999
55+60+40+45
=(55+45)+(60+40)
=100+100
=200
=408-98
=318
25×(2+4)
=25×2+25×4
=50+100
=150
12×5+8
=60+8
=68
99×101
=99×(100+1)
=99×100+99×1
=9900+99
=9999
55+60+40+45
=(55+45)+(60+40)
=100+100
=200
第4个回答 2019-07-03
4×102-2×49
=408-98
=310
25×(2+4)
=25×6
=150
12×5+8
=60+8
=68
99×101
=99×(100+1)
=9900+99
=9999
55+60+40+45
=(55+45)+(60+40)
=100+100
=200
=408-98
=310
25×(2+4)
=25×6
=150
12×5+8
=60+8
=68
99×101
=99×(100+1)
=9900+99
=9999
55+60+40+45
=(55+45)+(60+40)
=100+100
=200