(1)3318+312÷24×205(2)47.1×9.4-47.1÷2-+47.1(3)[(1-0.5)×20]÷[(1+0.25)÷4](4)12-13+14(5)100-99+98-97+96-…+4-3+2-1(6)15×6+16×7+17×8+------+149×50.-数学
题文
(1)3318+312÷24×205 (2)47.1×9.4-47.1÷2-+47.1 (3)[(1-0.5)×20]÷[(1+0.25)÷4] (4)
(5)100-99+98-97+96-…+4-3+2-1 (6)
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答案
(1)3318+312÷24×205, =3318+13×205, =3318+2665, =5983; (2)47.1×9.4-47.1÷2-47.1, =47.1×(9.4-0.5-1), =47.1×7.9, =372.09; (3)[(1-0.5)×20]÷[(1+0.25)÷4], =10÷0.3125, =32; (4)
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(5)100-99+98-97+96-…+4-3+2-1, =(100-99)+(98-97)+(96-95)+…+(4-3)+(2-1), =1×50, =50; (6)
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