19.98×37-199.8×1.9+1998×0.82 888+32×0.125×0.25 7.8÷[32×(1-58
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19.98×37-199.8×1.9+1998×0.82 | 888+32×0.125×0.25 | |
7.8÷[32×(1-
(1)19.98×37-199.8×1.9+1998×0.82,
=19.98×37-19.98×19+19.98×82, =19.98×(37-19+82), =19.98×100, =1998; (2)888+32×0.125×0.25, =888+(8×4)×0.125×0.25, =888+(8×0.125)×(4×0.25), =888+1×1, =888+1, =889; (3)7.8÷[32×(1- 5 8)+3.6], =7.8÷[32× 3 8+3.6], =7.8÷[12+3.6], =7.8÷15.6, =0.5; (4) 1 1×2+ 1 2×3+ 1 3×4+…+ 1 99×100, =(1- 1 2)+( 1 2- 1 3)+( 1 3- 1 4)+…+( 1 99- 1 100), =1- 1 2+ 1 2- 1 3+ 1 3- 1 4+…+ 1 99- 1 100, =1- 1 100, = 99 100.
用简便方法计算:19.98*37-199.8*1.9+1998*0.82
用简便方法计算 19.98×37-199.8×1.9+1998×0.82
计算:19.98×37-199.8×1.9+1998×0.82=______.
19.98*37-199.8*1.9+1998*0.82的简便运算
19.98×37-199.8×1.9 1998×0.
简算19.98×37-199.8×1.9+1998×0.82 7×13×(
简便运算;15*888+32*0.125*0.25
四道简便计算,..四道:答完了我会忠心感谢你的!1:19.98乘37-199.8乘1.9=1998乘0.822:7.6乘
简算这道题:(千万看清楚中间是除号)15×888+32÷0.125×0.25
19.98×37-199.8×1.9+1.998×20简便计算怎么算
第一讲全部答案,2000×199.9-1999×199.8 19.98×37-199.8×1.9+1.998×820 9
1÷32÷0.5÷0.25÷0.125=(简便运算)
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