脱式计算.(能用简便方法计算用简便方法计算)70.08-1.25-1.75 4.6+2.89+5.4+3.11 22×101 45×36+54×36+36 25×(4×27) 85×99+85.
(1)70.08-1.25-1.75, =70.08-(1.25+1.75), =70.08-3, =67.08; (2)4.6+2.89+5.4+3.11, =(4.6+5.4)+(2.89+3.11), =10+6, =16; (3)22×101, =22×100+22×1, =2200+22, =2222; (4)45×36+54×36+36, =(45+54+1)×36, =100×36, =3600; (5)25×(4×27), =(25×4)×27, =100×27, =2700; (6)85×99+85, =85×(99+1), =85×100, =8500. |
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