
用简便方法计算 25×49+75×49 575-78-22 &n...
用简便方法计算25×49+75×49575-78-22654+1848×89+48367-19956×102....
用简便方法计算 25×49+75×49 575-78-22 654+18 48×89+48 367-199 56×102.
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①25×49+75×49
=49×(25+75)
=49×100
=4900
②575-78-22
=575-(78+22)
=575-100
=475
③654+18
=654+20-2
=674-2
=672
④48×89+48
=48×(89+1)
=48×90
=4320
⑤367-199
=367-200+1
=167+1
=168
⑥56×102
=56×(100+2)
=56×100+56×2
=5600+112
=5712
=49×(25+75)
=49×100
=4900
②575-78-22
=575-(78+22)
=575-100
=475
③654+18
=654+20-2
=674-2
=672
④48×89+48
=48×(89+1)
=48×90
=4320
⑤367-199
=367-200+1
=167+1
=168
⑥56×102
=56×(100+2)
=56×100+56×2
=5600+112
=5712
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