脱式计算,能简算的要简算. ①10962÷54-105②0.25×(4.8-7.5÷3)③0.65+2+6.35+④×÷(-)⑤9.07×93-9.07+9.07×8⑥0.125×(5+0.8)+0.125÷.
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解:
①10962÷54-105,
=203-105,
=98;
②0.25×(4.8-7.5÷3),
=0.25×(4.8-2.5),
=0.25×2.3,
=0.575;
③0.65+2+6.35+,
=(0.65+6.35)+(2+),
=7+3,
=10;
④×÷(-),
=×÷,
=÷,
=;
⑤9.07×93-9.07+9.07×8,
=9.07×(93-1+8),
=9.07×100,
=907;
⑥0.125×(5+0.8)+0.125÷,
=0.125×5+0.125×0.8+0.125×3,
=0.125×5+0.125×3+0.125×0.8,
=0.125×(5+3)+0.1,
=0.125×8+0.1,
=1+0.1,
=1.1.
解析分析:①先算除法,再算减法;②先算除法,再算减法,最后算乘法;③根据加法交换律和结合律进行计算;④先算减法,再算乘法,最后算除法;⑤根据乘法分配律进行计算;⑥根据乘法分配律进行计算.
点评:四则运算,先弄清运算顺序,然后再进一步计算,能简算的要简算.