计算下面各题,能用简便方法的要用简便方法计算.98+265+202 105×26-5×26 101×875.
计算下面各题,能用简便方法的要用简便方法计算.98+265+202105×26-5×26101×875.6+2.7+4.49.14-1.43-4.579.84-(2.84...
计算下面各题,能用简便方法的要用简便方法计算.98+265+202 105×26-5×26 101×875.6+2.7+4.4 9.14-1.43-4.57 9.84-(2.84+1.86)5.17-1.8-3.2 4.02-3.5+0.98 13.7+0.98+0.02+4.3
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(1)98+265+202
=(98+202)+265
=300+265
=565
(2)105×26-5×26
=(105-5)×26
=100×26
=2600
(3)101×87
=(100+1)×87
=100×87+87
=8700+87
=8787
(4)5.6+2.7+4.4
=(5.6+4.4)+2.7
=10+2.7
=12.7
(5)9.14-1.43-4.57
=9.14-(1.43+4.57)
=9.14-6
=3.14
(6)9.84-(2.84+1.86)
=(9.84-2.84)-1.86
=7-1.86
=5.14
(7)5.17-1.8-3.2
=5.17-(1.8+3.2)
=5.17-5
=0.17
(8)4.02-3.5+0.98
=(4.02+0.98)-3.5
=5-3.5
=1.5
(9)13.7+0.98+0.02+4.3
=(13.7+4.3)+(0.98+0.02)
=18+1
=19
=(98+202)+265
=300+265
=565
(2)105×26-5×26
=(105-5)×26
=100×26
=2600
(3)101×87
=(100+1)×87
=100×87+87
=8700+87
=8787
(4)5.6+2.7+4.4
=(5.6+4.4)+2.7
=10+2.7
=12.7
(5)9.14-1.43-4.57
=9.14-(1.43+4.57)
=9.14-6
=3.14
(6)9.84-(2.84+1.86)
=(9.84-2.84)-1.86
=7-1.86
=5.14
(7)5.17-1.8-3.2
=5.17-(1.8+3.2)
=5.17-5
=0.17
(8)4.02-3.5+0.98
=(4.02+0.98)-3.5
=5-3.5
=1.5
(9)13.7+0.98+0.02+4.3
=(13.7+4.3)+(0.98+0.02)
=18+1
=19
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