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1 直接写出得数。
(1) $20×50 -80=$
(2) $230+90+70=$
(3) $900-99+1=$
(4) $96÷12×12=$
(5) $45×7+3=$
(6) $75 -75÷5=$
(7) $770×8÷70=$
(8) $16×5×2=$
(9) $32+8×2=$
(10) $\frac{4}{15} - \frac{11}{15} + \frac{7}{15}=$
(1) $20×50 -80=$
(2) $230+90+70=$
(3) $900-99+1=$
(4) $96÷12×12=$
(5) $45×7+3=$
(6) $75 -75÷5=$
(7) $770×8÷70=$
(8) $16×5×2=$
(9) $32+8×2=$
(10) $\frac{4}{15} - \frac{11}{15} + \frac{7}{15}=$
答案
(1) 920 (2) 390 (3) 802 (4) 96 (5) 318 (6) 60 (7) 88 (8) 160 (9) 48 (10) 0
2 用递等式计算(能简便计算的要用简便方法计算)。
(1) $250 × 8 - 1000 ÷ 8$
(2) $125 × 6 × 8$
(3) $72 × 36 + 18 × 36$
(4) $412 ÷ (607 - 36 × 14)$
(5) $444 × 25$
(6) $80 × [360 - (325 + 7)]$
(7) $\frac{26}{35} - \frac{9}{35} + \frac{11}{35}$
(8) $\frac{1}{100} + \frac{99}{100} - \frac{7}{9}$
(1) $250 × 8 - 1000 ÷ 8$
(2) $125 × 6 × 8$
(3) $72 × 36 + 18 × 36$
(4) $412 ÷ (607 - 36 × 14)$
(5) $444 × 25$
(6) $80 × [360 - (325 + 7)]$
(7) $\frac{26}{35} - \frac{9}{35} + \frac{11}{35}$
(8) $\frac{1}{100} + \frac{99}{100} - \frac{7}{9}$
答案
(1) 1875 (2) 6000 (3) 3240 (4) 4 (5) 11100 (6) 2240 (7) $\frac{28}{35}$ (8) $\frac{2}{9}$
