简便计算:12.4-12.4×0.25,0.25×9+1÷8.
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/13 06:46:57
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简便计算:12.4-12.4×0.25,0.25×9+1÷8.
简便计算:12.4-12.4×0.25,0.25×9+1÷8.
简便计算:12.4-12.4×0.25,0.25×9+1÷8.
12.4-12.4*0.25
=3.1*4 - 3.1*4*0.25
=3.1*4 - 3.1*(4*0.25)
=3.1*4-3.1
=3.1*(4-1)
=3.1*3
=9.3
0.25*9+1÷8
=(0.25*9*8 + 1÷8*8) ÷ 8
=(0.25*4*9*2 + 1)÷8
=(18+1)÷8
=19÷8
=2.375
12.4-12.4×0.25 =12.4×1-12.4×1/4 =12.4×(1-1/4) =12.4×3/4 =3.1×3 =9.3 0.25×9+1÷8 =1/4×9+1/8 =1/8×18+1/8×1 =1/8×(18+1) =19/8 (8分之19)