简便运算 只要是对的就行!快今天就要!明天回答的就没奖金187-（87+15） 1048-531-469 965+200-4 78+247+122 487-87+258 242-125+358-275 800-127-75-273 14.5+7.65×4+25.5+2.35×4+40400-82.63-17.37 7.29+23.64+13.71 2100÷42 630÷14

Question

简便运算 只要是对的就行!快今天就要!明天回答的就没奖金
187-（87+15） 1048-531-469 965+200-4 78+247+122 487-87+258 242-125+358-275 800-127-75-273 14.5+7.65×4+25.5+2.35×4+40
400-82.63-17.37 7.29+23.64+13.71 2100÷42 630÷14

Answer 1

187-（87+15）
=187-87-15
=100-15
=85
              1048-531-469       
=1048-（531+469）
=1048-1000
48
965+200-4
=1165-4
=1161
78+247+122
=78+22+247
=200+247
=447
487-87+258
=400+258
=658
242-125+358-275
=242+358-（125+275）
=600-400
200
800-127-75-273
=800-（127+273）-75
=800-400-75
=400-75
= 325
14.5+7.65×4+25.5+2.35×4+40
= 7.65×4+2.35×4+40+14.5+25.5
=（7.65+2.35）×4+40+（14.5+25.5）
=40+40+40
120
400-82.63-17.37
=400-（82.63+17.37）
=400-100
=300
7.29+23.64+13.71
=7.29+13.71 +23.64
=21+23.64
44.64
2100÷42
=2100÷21÷2
=100÷2
=50
630÷14
=630÷7÷2
=90÷2
=45