简便计算:90.1-9.9 (1\6+¼-1\8)×480 90.1×9.9 21+22+23+24+.+10
来源:学生作业帮 编辑:神马作文网作业帮 分类:数学作业 时间:2024/11/13 18:09:25
简便计算:90.1-9.9 (1\6+¼-1\8)×480 90.1×9.9 21+22+23+24+.+100
90.1-9.9
= 90.1 - (10 - 0.1)
= 90.1 - 10 + 0.1
= 80.2
(1\6+¼-1\8)×480
= (1/3 + 1/2 - 1/4)×240
= (1/3 + 1/4)×240
= (1/3 + 1/4)×12×20
= (4 + 3)×20
= 140
90.1×9.9
= 90.1×(10-0.1)
= 901 - 9.01
= 900 - 9 + 1 - 0.01
= 891 + 0.99
= 891.99
21+22+23+24+.+100
= (21+100) × 80 ÷ 2
= 121× 80 ÷ 2
= 121× 40
= 4840
= 90.1 - (10 - 0.1)
= 90.1 - 10 + 0.1
= 80.2
(1\6+¼-1\8)×480
= (1/3 + 1/2 - 1/4)×240
= (1/3 + 1/4)×240
= (1/3 + 1/4)×12×20
= (4 + 3)×20
= 140
90.1×9.9
= 90.1×(10-0.1)
= 901 - 9.01
= 900 - 9 + 1 - 0.01
= 891 + 0.99
= 891.99
21+22+23+24+.+100
= (21+100) × 80 ÷ 2
= 121× 80 ÷ 2
= 121× 40
= 4840
简便计算:90.1-9.9 (1\6+¼-1\8)×480 90.1×9.9 21+22+23+24+.+10
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