列式计算。,V,l(B-r3{2T
(1)420减去80,差是多少?,V,l(B-r3{2T
4e9{*]9v6c5E2l)M+e6B:l(|1j2x'|,V,l(B-r3{2T
(2)600加上370,和是多少?,V,l(B-r3{2T
3]:T-y'S,V,l(B-r3{2T
(3)1900比600多多少?,V,l(B-r3{2T
0K3?1Z;_)f0P5[5U9G/f:D,V,l(B-r3{2T
(4)90比820少多少?,V,l(B-r3{2T
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