题目内容
口算.
|
(1) |
(2) |
|
300 +400= |
370 -180= |
|
900 -500= |
460 -250= |
|
700 -60= |
500 -330= |
|
140 +70= |
290 +220= |
|
(3) |
(4) |
|
700 -7= |
297 +8= |
|
896 +8= |
602 -4= |
|
502 -9= |
693 +7= |
|
496 +6= |
701 -6= |
答案:700,400,640,210;190,210,170,510;693,904,493,502;305,598,700,695
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