四、解决问题
★信息窗1-1
建议用时:7分钟
实际用时:分钟
50+40-30 =
360+40+400 =
760-320+50 =
270+60+40 =
56-38+42 =
77-30+42 =
72-30+56 =
500+50+50 =
32+46-37 =
89-42-30 =
27+27+20 =
92-40+37 =
26+47-30 =
96-30-22 =
50+70+80 =
700+60-40 =
129-70+60 =
1500-300+200 =
1000-400+600 =
600-400+100 =
5000+4000-3000 =
8000-5000-2000 =
3600-400+200 =
700-358+58 =
2000+4000+2000 =
600+400+200 =
3700-700-0 =
300+400+500 =
100+400+300 =
600-400+200 =
37+210 =
510+27 =
427+300 =
56+130 =
440+200 =
6×9 =
21÷7 =
35÷4 =
28+54 =
140+270 =
210+90 =
57+27 =
8×8 =
54÷9 =
23÷5 =

$50+40-30=60$
$360+40+400=800$
$760-320+50=490$
$270+60+40=370$
$56-38+42=60$
$77-30+42=89$
$72-30+56=98$
$500+50+50=600$
$32+46-37=41$
$89-42-30=17$
$27+27+20=74$
$92-40+37=89$
$26+47-30=43$
$96-30-22=44$
$50+70+80=200$
$700+60-40=720$
$129-70+60=119$
$1500-300+200=1400$
$1000-400+600=1200$
$600-400+100=300$
$5000+4000-3000=6000$
$8000-5000-2000=1000$
$3600-400+200=3400$
$700-358+58=400$
$2000+4000+2000=8000$
$600+400+200=1200$
$3700-700-0=3000$
$300+400+500=1200$
$100+400+300=800$
$600-400+200=400$
$37+210=247$
$510+27=537$
$427+300=727$
$56+130=186$
$440+200=640$
$6×9=54$
$21÷7=3$
$35÷4=8······3$
$28+54=82$
$140+270=410$
$210+90=300$
$57+27=84$
$8×8=64$
$54÷9=6$
$23÷5=4······3$

拓展园地
下列选项中,哪个图形能一笔画成?（）

A