口算算术
1.90-9= 24-10-7=
46+5= 20+13-9=
8+57= 34+(25+5)=
98-70= 58-(58-8)=
65+20= 39+7-20=
2.25+7= 50-8=
86-5= 4+65=
20+67= 42+30=
73-40= 85-7=
8+45= 76-60=
人气:294 ℃ 时间:2020-07-09 03:38:13
解答
= =|||1. 90-9=8124-10-7=7 46+5=51 20+13-9=24 8+57=65 34+(25+5)=64 98-70=2858-(58-8)=8 65+20=8539+7-20=262. 25+7=32 50-8=...
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