17.2÷2+2.8×0.5  1.72÷4+2.28×0.25 怎样简便计算

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/09 11:40:19
17.2÷2+2.8×0.5  1.72÷4+2.28×0.25 怎样简便计算

17.2÷2+2.8×0.5  1.72÷4+2.28×0.25 怎样简便计算
17.2÷2+2.8×0.5  1.72÷4+2.28×0.25 怎样简便计算

17.2÷2+2.8×0.5  1.72÷4+2.28×0.25 怎样简便计算
17.2÷2+2.8×0.5
=17.2×0.5+2.8×0.5
=(17.2+2.8)×0.5
=20×0.5
=10
1.72÷4+2.28×0.25
=1.72×0.25+2.28×0.25
=(1.72+2.28)×0.25
=4×0.25
=1

17×40=680, 100-63=37, 3.2+1.68=4.88, 2.8×0.4= 1.123+25=148 123-35=88 56×7=392 135÷5=27 248+89=337 146-

17.2×1/2+2.8×0.5=(17.2+2.8)×1/2=10
1.72×1/4+2.28×0.25=(1.72+2.28)×1/4=1